The document discusses various input devices and their advantages and disadvantages. It covers keyboards, mice, joysticks, touchscreens, scanners, cameras, microphones, sensors and more. For each device it lists 2-3 advantages and 2-3 disadvantages in point form. The overall document provides an overview comparison of different input devices.
This document discusses several types of portable communication devices including mobile phones, portable DVD players, portable media players, global positioning systems, satellite navigation systems, handheld computers, and Bluetooth. It provides brief descriptions of how each device works and lists their main advantages and disadvantages.
CRT monitors use electron guns to shoot electrons at phosphor particles to display an image, but they are heavy, emit radiation, and cause eye strain. TFT monitors use thin film transistors and liquid crystals to display each pixel and are lighter and cause less eye strain. Laser printers use toner and an electrically charged drum to produce high-quality, fast outputs while inkjet printers produce high-quality color prints but are slower. Dot matrix printers use pins and ink ribbons for noisy, multi-copy printing. Plotters can produce large, high-quality graphics and blueprints using pens or inkjets. Speakers output sound files from computers.
The document discusses various input devices and their advantages and disadvantages. It covers keyboards, mice, trackballs, touchscreens, scanners, microphones, cameras, bar code readers and smart devices. Some key advantages mentioned are speed, ease of use, accuracy and benefits for people with disabilities. Disadvantages include potential for errors, difficulty entering long passages of text, required control and potential health issues from overuse.
This document discusses various types of output devices used with computers. It describes CRT monitors, TFT monitors, laser printers, inkjet printers, 3D inkjet printers, dot matrix printers, plotters, speakers, and multimedia projectors. For each device type, it provides details on their uses, advantages, and disadvantages.
This document discusses and compares various storage media devices including tape drives, optical discs, solid state drives, and portable music players. Tape drives are cheaper than disks but have slower access, while optical discs like CDs and DVDs can hold more data than floppy disks but have slower transfer rates than hard disks. Solid state drives are more compact and robust than hard disks but are more expensive per gigabyte. The document provides advantages and disadvantages of each storage medium.
The joystick is an input device used mainly for video games that consists of a stick that pivots on a base and reports its angle or direction to control aspects of a game or aircraft in a simulation. It often has additional buttons or switches to control different functions and is connected to gaming consoles, computers or aircraft flight simulators. Joysticks provide analog control of movement or other functions through the angle of the stick in one or more axes.
The document provides an overview of computer hardware input and output devices. It describes common input devices like the keyboard, mouse, and scanners that allow data to be entered into the computer. It also discusses output devices like monitors, printers, and speakers that allow the computer to display or present information to users. A diagram shows the basic components of a computer system including the central processing unit, memory, hard drive, and connections to input and output devices.
1. The document discusses various input and output devices used in computing including keyboards, mice, joysticks, scanners, light pens, trackballs, touch screens, monitors, and printers.
2. Input devices allow users to enter data into computers through typing, pointing, speaking, or scanning. Output devices display or print information from computers in visual or physical forms.
3. Monitors are the main visual output device and include CRT, LCD, LED, and flat screen variants. Printers provide physical printouts and include impact printers like dot matrix and daisy wheel, as well as non-impact printers like inkjet and laser printers.
This document discusses several types of portable communication devices including mobile phones, portable DVD players, portable media players, global positioning systems, satellite navigation systems, handheld computers, and Bluetooth. It provides brief descriptions of how each device works and lists their main advantages and disadvantages.
CRT monitors use electron guns to shoot electrons at phosphor particles to display an image, but they are heavy, emit radiation, and cause eye strain. TFT monitors use thin film transistors and liquid crystals to display each pixel and are lighter and cause less eye strain. Laser printers use toner and an electrically charged drum to produce high-quality, fast outputs while inkjet printers produce high-quality color prints but are slower. Dot matrix printers use pins and ink ribbons for noisy, multi-copy printing. Plotters can produce large, high-quality graphics and blueprints using pens or inkjets. Speakers output sound files from computers.
The document discusses various input devices and their advantages and disadvantages. It covers keyboards, mice, trackballs, touchscreens, scanners, microphones, cameras, bar code readers and smart devices. Some key advantages mentioned are speed, ease of use, accuracy and benefits for people with disabilities. Disadvantages include potential for errors, difficulty entering long passages of text, required control and potential health issues from overuse.
This document discusses various types of output devices used with computers. It describes CRT monitors, TFT monitors, laser printers, inkjet printers, 3D inkjet printers, dot matrix printers, plotters, speakers, and multimedia projectors. For each device type, it provides details on their uses, advantages, and disadvantages.
This document discusses and compares various storage media devices including tape drives, optical discs, solid state drives, and portable music players. Tape drives are cheaper than disks but have slower access, while optical discs like CDs and DVDs can hold more data than floppy disks but have slower transfer rates than hard disks. Solid state drives are more compact and robust than hard disks but are more expensive per gigabyte. The document provides advantages and disadvantages of each storage medium.
The joystick is an input device used mainly for video games that consists of a stick that pivots on a base and reports its angle or direction to control aspects of a game or aircraft in a simulation. It often has additional buttons or switches to control different functions and is connected to gaming consoles, computers or aircraft flight simulators. Joysticks provide analog control of movement or other functions through the angle of the stick in one or more axes.
The document provides an overview of computer hardware input and output devices. It describes common input devices like the keyboard, mouse, and scanners that allow data to be entered into the computer. It also discusses output devices like monitors, printers, and speakers that allow the computer to display or present information to users. A diagram shows the basic components of a computer system including the central processing unit, memory, hard drive, and connections to input and output devices.
1. The document discusses various input and output devices used in computing including keyboards, mice, joysticks, scanners, light pens, trackballs, touch screens, monitors, and printers.
2. Input devices allow users to enter data into computers through typing, pointing, speaking, or scanning. Output devices display or print information from computers in visual or physical forms.
3. Monitors are the main visual output device and include CRT, LCD, LED, and flat screen variants. Printers provide physical printouts and include impact printers like dot matrix and daisy wheel, as well as non-impact printers like inkjet and laser printers.
Tablet PCs have evolved from traditional tablet PCs that run desktop operating systems to newer post-PC tablets that run mobile operating systems. They are larger than smartphones and use touchscreens as their primary input, often with virtual keyboards, styluses, or digital pens. Tablet PCs can have resistive or capacitive touchscreens, with capacitive being more common, as well as features like accelerometers, ambient light sensors, wireless connectivity, and docking stations. Handwriting recognition is common for stylus-based tablets.
1) A flatbed scanner works by using a glass scanning surface where objects are placed. It scans images as a series of dots using rotating lamps with colored filters and a CCD sensor to generate a digitized image file.
2) When scanning, the CCD sensor moves across the glass platen to read the image as dots. Software then converts this into an electronic code that can be understood by the computer.
3) Flatbed scanners allow scanning of documents without bending them and can scan a variety of paper types and qualities as well as larger documents than sheet-fed scanners. Their glass surface risks scratching over time however.
Output devices such as monitors, printers, and speakers are discussed. Monitors can be CRT or TFT, with TFT being newer, smaller, and quieter than CRT but with potentially less quality. Printers include laser, inkjet, dot matrix, and plotters. Laser printers are fast and high quality but expensive, while inkjet printers are cheaper but slower. Dot matrix printers can make carbon copies but are low quality and loud. Plotters can print on large paper but are slow. Speakers help with using computers but can disturb others, while lights provide status signals.
This document discusses various types of computer output devices. It describes monitors/displays, printers, plotters, speakers/headphones, and multimedia projectors. For monitors, it covers CRT, LCD, plasma, and touch screen monitors. For printers, it discusses impact printers like dot matrix and daisy wheel, and non-impact printers like inkjet, laser, thermal, photo, and mobile printers. Plotters are used to produce high-quality color graphics. Speakers and headphones provide audio output, while projectors are used to project computer displays onto screens for presentations.
The document provides an overview of computer hardware components, including input devices like keyboards and mice, output devices like monitors and printers, processing components like the CPU and memory, storage devices like hard drives and flash drives, ports for connecting peripherals, and power controls. It describes the functions of the basic parts of a computer and how they work together to process data.
IT Training
DSF 2015
Done by: Mohammed Marwan Shahin
Senior Technical Trainer
The document outlines an IT training presentation covering:
1) An introduction to PCs and identifying customer needs based on use cases. Sections on PC platforms, printers, networking, accessories, and FAQs.
2) Details on PC types for everyday, multimedia, and gaming users. Printer types, features, and questions to identify customer needs.
3) Networking technologies like routers, extenders, and adapters. Accessories include mice, keyboards, cases, and cooling pads.
4) An overview of Intel processors, questions to help with sales, and common FAQs.
The document provides an overview of computer hardware basics including input, output, and storage devices. It describes common input devices like keyboards and pointing devices. It discusses output to screens, printers, and other devices. It also covers various storage media including magnetic disks, tapes, and optical disks. The document emphasizes that computer systems integrate various input, output, and storage peripherals and that networks allow sharing of resources between multiple computers.
Application software refers to programs that fulfill specific user needs and tasks, such as office suites, web browsers, and media players. Common examples include spreadsheets like Excel for calculations, presentation software like PowerPoint, and graphic editors. Application software provides tools to help users perform tasks like managing budgets, creating slideshows, and photo editing. It interfaces with the operating system and hardware to provide functionality to end users.
Output devices translate information processed by computers into a form that humans can understand. There are two main categories of output devices: softcopy and hardcopy. Softcopy output devices like monitors use technologies like cathode ray tubes, liquid crystal displays, plasma, and LEDs to visually display information on screens. Hardcopy output devices like printers physically output information on paper. Monitors use technologies that emit electrons or light to illuminate pixels and form images, while printers physically deposit ink on paper.
The document discusses various types of computer output devices, including displays, printers, and speakers. It describes CRT and flat panel displays, inkjet and laser printers, and speakers. It provides details on how these devices work, their features and specifications like resolution, and examples of their uses. The document also covers other output devices such as data projectors, fax machines, and options for visually impaired users.
Computer – Hardware
Hardware represents the physical and tangible components of a computer, i.e. the components that can be seen and touched.
Examples of Hardware are the following −
Input devices − keyboard, mouse, etc.
Output devices − printer, monitor, etc.
Secondary storage devices − Hard disk, CD, DVD, etc.
Internal components − RAM,CPU, motherboard, etc.
INPUT AND OUTPUT DEVICES OF COMPUTER Input Devices A device that can be used to insert data into a computer system is called as input device. It allows people to supply information to computers without any input devices, a computer would only be a display device and not allow users to interact with it, Examples of input devices include keyboards, mouse, scanners, digital cameras and Light pen, joysticks, Touch-screen, OMR, OBR,OCR. Keyboard Most common and very popular input device is keyboard. The keyboard helps in inputting the data to the computer. The layout of the keyboard is like that of traditional typewriter, although there are some additional keys provided for performing some additional functions. Keyboard is of two sizes 84 keys or 101/102 keys, but now 104 keys or 108 keys keyboard is also available for Windows and Internet. Mouse Mouse is most popular Pointing device. It is a very famous cursor-control device. It is a small palm size box with a round ball at its base which senses the movement of mouse and sends corresponding signals to CPU on pressing the buttons. Generally it has two buttons called left and right button and scroll bar is present at the mid. Mouse can be used to control the position of cursor on screen, but it cannot be used to enter text into the computer.
The document discusses various computer input, output, and storage devices. It describes keyboards, mice, joysticks, scanners, and other common input devices. Output devices mentioned include monitors, printers, plotters, and more. Storage devices covered are primary storage like RAM and ROM, as well as secondary storage such as hard disks, CDs, DVDs, USB drives, floppy disks, and other removable media.
Computers can be categorized by size and performance. Personal computers like desktops and laptops are microcomputers commonly used by individuals. Larger systems include minicomputers and mainframes used by large organizations. A computer contains a processor, memory, storage, input/output devices, and software. It executes programs to perform tasks like banking, weather forecasting, and medical diagnosis. Hardware components communicate via the motherboard and work together under the instruction of software.
The document describes different types of computer output devices. It discusses displays such as LCD monitors and their characteristics like resolution, response time, and brightness. It covers various printer technologies like inkjet printers, photo printers, and laser printers. It also mentions speakers, headphones, data projectors, and other output options for conveying information to users.
Computer output devices are used to provide information to users in different formats like visual, audio, and digital. Common output devices include monitors, speakers, printers, projectors, and plotters. Monitors display visual information by processing data through a video card and using pixels created by technologies like LCD. Speakers output audio information by processing audio data through an audio card and translating it into audio signals. Printers provide a hard copy output on paper and come in different types like inkjet and laser printers. Projectors display large images onto screens by processing image data and translating it into video to project. Plotters similarly create hard copy drawings by processing design data and using pens to draw images through a series of lines.
The document discusses various types of output devices including display screens, printers, audio devices, and virtual reality devices. It provides details on CRT monitors, describing screen resolution, dot pitch, and refresh rate. It also covers LCD monitors, inkjet printers, laser printers, photo printers, thermal printers, plotters, and audio output devices such as speakers. Facsimile machines and data projectors are also mentioned as other examples of output hardware.
The document defines what a computer is and provides some key details:
- A computer is an electronic device that processes information according to a set of instructions called a program.
- Charles Babbage is considered the grandfather of computers for designing the Analytical Engine, one of the first mechanical computers.
- Computers have four main functions: input, processing, output, and storage. Input devices allow a user to input data and commands, processing is the operation on the data, output is the processed results, and storage saves results.
- Common input devices include keyboards, mice, scanners, cameras, microphones, and touchscreens. Output devices like monitors and printers display or print the processed data.
This document provides information about various hardware devices used in information processing systems. It discusses input devices like keyboards, mice, touch screens, and scanners. It also covers output devices such as monitors, printers, and projectors. Storage devices covered include hard drives, flash drives, and optical media. Each device is described in terms of its common uses, advantages, and limitations. Troubleshooting tips are provided for some devices.
C hapter 1 types-and_components_of_computer_system[1][1]Pratik Gupta
This document defines and describes the main components of a computer system, including both hardware and software. It discusses the central processing unit, memory, input/output and storage devices, as well as operating systems and user interfaces. Different types of computers are also covered, from mainframes to personal computers, laptops, palmtops and personal digital assistants. The key components that make up all computer systems are hardware to run the software and software containing instructions to operate the hardware.
Input devices allow data to be entered into a computer and can be manual or automatic. Manual input devices include keyboards, mice, touchpads, joysticks, scanners, touchscreens, digital cameras, and microphones. Automatic input devices include magnetic ink character recognition, optical mark recognition, optical character recognition, barcode readers, and sensors. Common input devices like keyboards and mice are fast and easy to use but can cause repetitive strain injuries, while devices like touchscreens are intuitive but have limited options.
The keyboard and mouse are the most common input devices, allowing users to enter text and control a pointer respectively. Digital cameras allow users to take digital photos or videos and transfer the files to a computer. Other input devices mentioned include barcode readers, optical mark recognition, optical character recognition, magnetic ink character readers, scanners, joysticks, and touchscreens. Common output devices include printers and visual display units like computer monitors. Many input and output devices can lead to repetitive strain injuries if overused.
Tablet PCs have evolved from traditional tablet PCs that run desktop operating systems to newer post-PC tablets that run mobile operating systems. They are larger than smartphones and use touchscreens as their primary input, often with virtual keyboards, styluses, or digital pens. Tablet PCs can have resistive or capacitive touchscreens, with capacitive being more common, as well as features like accelerometers, ambient light sensors, wireless connectivity, and docking stations. Handwriting recognition is common for stylus-based tablets.
1) A flatbed scanner works by using a glass scanning surface where objects are placed. It scans images as a series of dots using rotating lamps with colored filters and a CCD sensor to generate a digitized image file.
2) When scanning, the CCD sensor moves across the glass platen to read the image as dots. Software then converts this into an electronic code that can be understood by the computer.
3) Flatbed scanners allow scanning of documents without bending them and can scan a variety of paper types and qualities as well as larger documents than sheet-fed scanners. Their glass surface risks scratching over time however.
Output devices such as monitors, printers, and speakers are discussed. Monitors can be CRT or TFT, with TFT being newer, smaller, and quieter than CRT but with potentially less quality. Printers include laser, inkjet, dot matrix, and plotters. Laser printers are fast and high quality but expensive, while inkjet printers are cheaper but slower. Dot matrix printers can make carbon copies but are low quality and loud. Plotters can print on large paper but are slow. Speakers help with using computers but can disturb others, while lights provide status signals.
This document discusses various types of computer output devices. It describes monitors/displays, printers, plotters, speakers/headphones, and multimedia projectors. For monitors, it covers CRT, LCD, plasma, and touch screen monitors. For printers, it discusses impact printers like dot matrix and daisy wheel, and non-impact printers like inkjet, laser, thermal, photo, and mobile printers. Plotters are used to produce high-quality color graphics. Speakers and headphones provide audio output, while projectors are used to project computer displays onto screens for presentations.
The document provides an overview of computer hardware components, including input devices like keyboards and mice, output devices like monitors and printers, processing components like the CPU and memory, storage devices like hard drives and flash drives, ports for connecting peripherals, and power controls. It describes the functions of the basic parts of a computer and how they work together to process data.
IT Training
DSF 2015
Done by: Mohammed Marwan Shahin
Senior Technical Trainer
The document outlines an IT training presentation covering:
1) An introduction to PCs and identifying customer needs based on use cases. Sections on PC platforms, printers, networking, accessories, and FAQs.
2) Details on PC types for everyday, multimedia, and gaming users. Printer types, features, and questions to identify customer needs.
3) Networking technologies like routers, extenders, and adapters. Accessories include mice, keyboards, cases, and cooling pads.
4) An overview of Intel processors, questions to help with sales, and common FAQs.
The document provides an overview of computer hardware basics including input, output, and storage devices. It describes common input devices like keyboards and pointing devices. It discusses output to screens, printers, and other devices. It also covers various storage media including magnetic disks, tapes, and optical disks. The document emphasizes that computer systems integrate various input, output, and storage peripherals and that networks allow sharing of resources between multiple computers.
Application software refers to programs that fulfill specific user needs and tasks, such as office suites, web browsers, and media players. Common examples include spreadsheets like Excel for calculations, presentation software like PowerPoint, and graphic editors. Application software provides tools to help users perform tasks like managing budgets, creating slideshows, and photo editing. It interfaces with the operating system and hardware to provide functionality to end users.
Output devices translate information processed by computers into a form that humans can understand. There are two main categories of output devices: softcopy and hardcopy. Softcopy output devices like monitors use technologies like cathode ray tubes, liquid crystal displays, plasma, and LEDs to visually display information on screens. Hardcopy output devices like printers physically output information on paper. Monitors use technologies that emit electrons or light to illuminate pixels and form images, while printers physically deposit ink on paper.
The document discusses various types of computer output devices, including displays, printers, and speakers. It describes CRT and flat panel displays, inkjet and laser printers, and speakers. It provides details on how these devices work, their features and specifications like resolution, and examples of their uses. The document also covers other output devices such as data projectors, fax machines, and options for visually impaired users.
Computer – Hardware
Hardware represents the physical and tangible components of a computer, i.e. the components that can be seen and touched.
Examples of Hardware are the following −
Input devices − keyboard, mouse, etc.
Output devices − printer, monitor, etc.
Secondary storage devices − Hard disk, CD, DVD, etc.
Internal components − RAM,CPU, motherboard, etc.
INPUT AND OUTPUT DEVICES OF COMPUTER Input Devices A device that can be used to insert data into a computer system is called as input device. It allows people to supply information to computers without any input devices, a computer would only be a display device and not allow users to interact with it, Examples of input devices include keyboards, mouse, scanners, digital cameras and Light pen, joysticks, Touch-screen, OMR, OBR,OCR. Keyboard Most common and very popular input device is keyboard. The keyboard helps in inputting the data to the computer. The layout of the keyboard is like that of traditional typewriter, although there are some additional keys provided for performing some additional functions. Keyboard is of two sizes 84 keys or 101/102 keys, but now 104 keys or 108 keys keyboard is also available for Windows and Internet. Mouse Mouse is most popular Pointing device. It is a very famous cursor-control device. It is a small palm size box with a round ball at its base which senses the movement of mouse and sends corresponding signals to CPU on pressing the buttons. Generally it has two buttons called left and right button and scroll bar is present at the mid. Mouse can be used to control the position of cursor on screen, but it cannot be used to enter text into the computer.
The document discusses various computer input, output, and storage devices. It describes keyboards, mice, joysticks, scanners, and other common input devices. Output devices mentioned include monitors, printers, plotters, and more. Storage devices covered are primary storage like RAM and ROM, as well as secondary storage such as hard disks, CDs, DVDs, USB drives, floppy disks, and other removable media.
Computers can be categorized by size and performance. Personal computers like desktops and laptops are microcomputers commonly used by individuals. Larger systems include minicomputers and mainframes used by large organizations. A computer contains a processor, memory, storage, input/output devices, and software. It executes programs to perform tasks like banking, weather forecasting, and medical diagnosis. Hardware components communicate via the motherboard and work together under the instruction of software.
The document describes different types of computer output devices. It discusses displays such as LCD monitors and their characteristics like resolution, response time, and brightness. It covers various printer technologies like inkjet printers, photo printers, and laser printers. It also mentions speakers, headphones, data projectors, and other output options for conveying information to users.
Computer output devices are used to provide information to users in different formats like visual, audio, and digital. Common output devices include monitors, speakers, printers, projectors, and plotters. Monitors display visual information by processing data through a video card and using pixels created by technologies like LCD. Speakers output audio information by processing audio data through an audio card and translating it into audio signals. Printers provide a hard copy output on paper and come in different types like inkjet and laser printers. Projectors display large images onto screens by processing image data and translating it into video to project. Plotters similarly create hard copy drawings by processing design data and using pens to draw images through a series of lines.
The document discusses various types of output devices including display screens, printers, audio devices, and virtual reality devices. It provides details on CRT monitors, describing screen resolution, dot pitch, and refresh rate. It also covers LCD monitors, inkjet printers, laser printers, photo printers, thermal printers, plotters, and audio output devices such as speakers. Facsimile machines and data projectors are also mentioned as other examples of output hardware.
The document defines what a computer is and provides some key details:
- A computer is an electronic device that processes information according to a set of instructions called a program.
- Charles Babbage is considered the grandfather of computers for designing the Analytical Engine, one of the first mechanical computers.
- Computers have four main functions: input, processing, output, and storage. Input devices allow a user to input data and commands, processing is the operation on the data, output is the processed results, and storage saves results.
- Common input devices include keyboards, mice, scanners, cameras, microphones, and touchscreens. Output devices like monitors and printers display or print the processed data.
This document provides information about various hardware devices used in information processing systems. It discusses input devices like keyboards, mice, touch screens, and scanners. It also covers output devices such as monitors, printers, and projectors. Storage devices covered include hard drives, flash drives, and optical media. Each device is described in terms of its common uses, advantages, and limitations. Troubleshooting tips are provided for some devices.
C hapter 1 types-and_components_of_computer_system[1][1]Pratik Gupta
This document defines and describes the main components of a computer system, including both hardware and software. It discusses the central processing unit, memory, input/output and storage devices, as well as operating systems and user interfaces. Different types of computers are also covered, from mainframes to personal computers, laptops, palmtops and personal digital assistants. The key components that make up all computer systems are hardware to run the software and software containing instructions to operate the hardware.
Input devices allow data to be entered into a computer and can be manual or automatic. Manual input devices include keyboards, mice, touchpads, joysticks, scanners, touchscreens, digital cameras, and microphones. Automatic input devices include magnetic ink character recognition, optical mark recognition, optical character recognition, barcode readers, and sensors. Common input devices like keyboards and mice are fast and easy to use but can cause repetitive strain injuries, while devices like touchscreens are intuitive but have limited options.
The keyboard and mouse are the most common input devices, allowing users to enter text and control a pointer respectively. Digital cameras allow users to take digital photos or videos and transfer the files to a computer. Other input devices mentioned include barcode readers, optical mark recognition, optical character recognition, magnetic ink character readers, scanners, joysticks, and touchscreens. Common output devices include printers and visual display units like computer monitors. Many input and output devices can lead to repetitive strain injuries if overused.
This document discusses various input and output devices. It begins by defining input devices as those that capture data and send it to a computer, converting physical movements or environmental data into electrical signals. There are two main types: manual devices like keyboards that require human control, and automatic devices like barcodes readers that input data without human intervention. Output devices are then defined as displaying or using information from a computer, through sound, images, text, or movement. Examples of common input devices discussed include keyboards, mice, scanners, and digital cameras. Output devices mentioned include monitors, speakers, printers, and plotters. The document provides details on the uses, advantages, and disadvantages of several of these key input and output devices.
The document describes and compares various manual and automatic input devices for computers. Under manual devices, it discusses keyboards, mice, trackballs, joysticks, microphones, digital cameras, scanners, and graphics tablets. It notes the advantages and disadvantages of each. Under automatic devices, it covers MICR, OMR, OCR, barcode readers, magnetic stripes, and sensors. It provides a brief overview of how each works and their pros and cons.
The keyboard has many keys divided into areas like alphabet, function, numeric, and arrow keys. The most common layout is QWERTY, named after its first six letters. Keyboards are used to enter data, and skilled typists can type very fast. Overuse can cause repetitive strain injury (RSI). Pointing devices like mice are also common input devices, starting with mechanical mice using rubber balls and now optical and cordless mice. Touchpads are for laptops in small spaces. Digital cameras store photos on memory cards instead of film. Barcode readers use lasers to read product information codes. Joysticks contain buttons and allow fast interactions for games. Output devices like printers provide a hard copy and come in types
There are two main types of signature capture technology: pressure sensitive (touch screen) and electromagnetic. Pressure sensitive uses technology that allows one to sign by touching a display screen with a plastic pen. Electromagnetic uses a magnetic field and electrical field with a special pen. Signature data is typically converted to vector format and transmitted to a host system via various protocols and formats. Devices range from simple and inexpensive models that transmit data via serial port, to more advanced models with processors, LCD screens and features like magnetic stripe readers.
The document discusses various input devices and their functions. It identifies keyboards, mice, touchpads, trackballs, joysticks, touch screens, magnetic stripe readers, chip readers, PIN pads, scanners, digital cameras, microphones, sensors, graphics tablets, MICR, OMR, OCR, barcode readers, video cameras, webcams, and light pens. For each device it provides examples of uses, advantages, and disadvantages. Students are asked to contribute their thoughts on certain devices and design or make a model keyboard for an assignment.
Input devices allow users to input data and instructions into a computer system. The document defines input devices and lists some common types like keyboards, mice, and scanners. It explains that input devices are essential because they enable interaction with computers and allow users to enter, edit, and feed new data. The advantages include fast text entry and ease of use, while disadvantages include taking up space and potential sensor errors. In conclusion, input devices are necessary hardware that transfers user input to computers.
The document discusses wearable computers. It defines wearable computers as small, portable computers designed to be worn on the body during use. It describes the key characteristics of wearable computers including being unmonopolizing, unrestrictive, observable, controllable, attentive, and communicative. The document outlines examples of wearable computers and their applications in fields like military, medical, and more. It discusses both the advantages of increased mobility, connectivity, and efficiency as well as disadvantages such as potential heaviness, expense, and privacy concerns.
This document provides an overview of input and output devices presented by a group to their instructor. It discusses keyboards, mice, touchpads, microphones, webcams, scanners, and various pointing devices as examples of input devices. It then covers printers, monitors, speakers, plotters, and projectors as examples of output devices that communicate information from the computer. The document discusses the definition, types, advantages and disadvantages of each device.
This document discusses various computer input devices including keyboards, mice, joysticks, scanners, MICR, OCR, and OMR. It provides details on each type of input device such as their purpose, components, advantages, and disadvantages. Keyboards allow text and symbol entry and have alphanumeric and function keys. Mice are used to control movement and selection via buttons. Joysticks are similar to arcade controls and used for games. Scanners convert printed materials into digital files. MICR, OCR, and OMR are used to read pre-printed coded text and marks on documents into computer-readable data.
This document discusses different types of computer input devices. It describes manual input devices like keyboards, mice, trackballs, joysticks, microphones, digital cameras and scanners that allow users to directly enter data. It also outlines automatic input devices such as MICR, OMR, OCR readers and barcode scanners that can automatically feed data into a computer. The document provides details on how each input device works and their advantages and disadvantages.
This document provides information on various computer input devices: keyboard, mouse, joystick, scanner, MICR, OCR, and OMR. It describes each device's purpose and basic functions. For each device it lists key advantages and disadvantages of the device in 1-2 sentences. The document is intended to inform the reader about common computer input hardware and their characteristics.
The document discusses several input and output devices for computers. It describes joysticks, which allow directional movement and button inputs for gaming. Scanners are used to digitize images and text, with flatbed scanners being the most common type. Printers provide hard copies of digital information at a speed measured in pages per minute. Speakers are used for sound output, with external speakers providing higher quality than internal computer speakers.
This document discusses biometrics techniques for authenticating users based on physical attributes. It outlines different biometric methods like retina scanning, fingerprint scanning, face and voice recognition. Each method has strengths like accuracy for retina scanning but also weaknesses like inconvenience of eye contact. The document also discusses false acceptance and rejection rates, major players using biometrics, and predicts biometrics will become more advanced, accurate and accepted over time.
class lecture on input & output devices(part1)sharif_12
The document discusses various common input devices used with computers including keyboards, mice, touchpads, and numeric keypads. It defines input devices as hardware that allows data to be entered into a computer. Keyboards are described as the most widely used input device for entering text, numbers, and commands. Mice and touchpads are pointing devices that control screen cursors. Numeric keypads are specialized for fast entry of numbers. Advantages and disadvantages of each type of input device are provided.
Input and output devices allow data and information to be entered into and displayed by a computer system. Input devices include keyboards, mice, and scanners that convert physical actions or images into digital signals. Output devices such as monitors, printers, and speakers convert electrical signals back into visual, audio, or tactile forms that users can understand. Common input devices require human interaction, while automatic devices like barcode readers input data without direct human control once configured.
This document discusses the features and uses of tablets. It notes that tablets can be used to keep track of emails, view documents and media. They are lightweight, have touchscreens, storage capacity of 64GB, screen sizes of 5-12 inches, and incorporate WiFi and mobile internet. Battery life ranges from 5-10 hours. Advantages include fast processors, touchscreens, and battery life, while disadvantages include limited software compatibility and hardware support depending on the brand.
The realm of mobile computing is composed of various types of mobile devices and their underlying software. Enabling or writing new software for mobile phones, or portable devices has become a new vertical in software development and testing. Smart phones are getting user-friendlier and day-to-day, new apps are being released to satisfy daily user needs. More and more user-friendly apps enable greater user interactions using stylus, touch-based gestures, multi-touch gestures, motion gestures etc. These introduce lot of challenges in development and testing. This document details the approach for mobile testing and the key focus areas for testing.
Virtual keyboards allow users to enter text through touchscreens or other input devices rather than physical keys. They have several types including those integrated into touchscreen devices and optically projected keyboards. Virtual keyboards provide mobility benefits and access to expanded character sets. While convenient for small devices, they can be slower than physical keyboards and require users to adapt to a new typing experience without key feedback or full-sized keys.
This document discusses three major nuclear accidents: Tokaimura, Japan in 1999; Three Mile Island, USA in 1979; and Fukushima, Japan in 2011. It outlines the key events and failures that led to each accident, including improper handling of nuclear material, loss of cooling systems, and natural disasters overwhelming safety systems. Lessons are highlighted around operator errors, poor emergency response, and design flaws that failed to adequately plan for all risks.
The document discusses several verses from the Quran related to the hardening of hearts. It describes how the hearts of some Jews became as hard as rock after continually denying Allah and turning away from his commands. Their scholars would distort Allah's words in scripture and issue religious rulings for money. Some were illiterate about their own religion and followed desires over truth. The passage criticizes those who claim they will only suffer briefly in hellfire without evidence. It says those who commit evil knowingly will be trapped there forever, while believers who do good will reside in paradise eternally.
1) The document is a word-to-word translation of a Quranic passage discussing various Arabic roots and their meanings as they relate to concepts like hardened hearts, flowing rivers, fear of Allah, and more.
2) It notes how some Jewish scholars distorted the words of Allah and wrote rulings for petty profits, earning destruction for what they wrote.
3) Common people are warned against saying they will only face fire for a few days, as they have no promise from Allah about this and should not say what they don't know.
4) The passage concludes that doers of evil will be ones of the fire forever, while believers who do good deeds will dwell in paradise forever.
This document provides information about the prophets Zakariya and his son Yahya. It states that Zakariya was saddened by people only working at the temple for power and praise. He prayed to Allah for a son to continue spreading Allah's message. Allah granted Zakariya a son, Yahya, who grew up to be righteous and obedient. Yahya taught the children of Israel to worship Allah alone and establish prayers, fasting, charity and remembrance of Allah in their daily lives. However, Yahya was later unjustly killed by a tyrant for refusing to approve of an unlawful marriage.
The document contains an Arabic verse translated to English followed by the original Arabic verse. The verse discusses having faith in God as the Most Merciful and relying on Him, stating that soon it will be clear who is in error for not doing so. The document provides the verse twice in Arabic script and twice in English translation for practice in recitation and understanding.
The document contains a word-for-word translation of an Islamic verse from the Quran. The verse asks disbelievers to consider what would happen if Allah destroyed the prophet Muhammad and his followers or showed them mercy - who could then protect the disbelievers from a painful punishment. It encourages practicing and spreading the message of this verse.
The document discusses a "Happy Land for Islamic Teachings" and describes how when non-believers see it approaching, their faces will be distressed. It states that they will be told that this is what they used to call for. The passage is repeated twice in the document for emphasis.
The document contains a word-for-word translation of a passage into English. The passage includes the phrase "Say, 'Only the knowledge (is) with Allah, and only I am a warner clear.'" which is translated at the end as "Say, 'The knowledge is only with Allah , and I am only a clear warner.'" The document provides the translation in both the original language and English for reference.
The document discusses a passage from the Quran where non-believers question prophets about the timing of divine promises. The passage is written in Arabic and translated to English. It is part of a larger teaching on Islamic scripture where students are asked to now practice interpreting the passage.
The document contains an Arabic phrase translated to English. The phrase references God as the one who multiplied humanity throughout the earth and to whom all will be gathered. The document then repeats the translated phrase.
The document contains an Arabic verse translated to English that emphasizes God as the creator of humanity who gave them senses like hearing, sight, and feelings. The verse notes that people are ungrateful for these gifts from God. It is repeated twice with commentary in between to practice and understand the meaning. The summary encourages gratitude to God for one's senses and existence.
The document discusses whether someone who walks with their face fallen is better guided or someone who walks upright on a straight path. It poses the rhetorical question of whether falling on one's face or walking upright on a straight path leads to better guidance. The document is titled "Happy Land for Islamic Teachings" and contains a word-for-word translation of a passage along with the translation itself.
The document contains excerpts from the Quran discussing various Islamic teachings. It references God's power and creation of the heavens and earth. It warns of punishment for disbelievers in hell and calls believers to have faith and trust in God. It questions if non-believers feel secure without God's provision and guidance.
The document is a word-for-word translation of a passage into English. The passage poses a rhetorical question about what would happen if a source of water was lost, asking who could provide replacement flowing water. It encourages considering this scenario and reflects on dependence on divine provision. The translation is attributed to Momina Mateen and is presented with repetitive headings of "Happy Land for Islamic Teachings".
The document discusses a passage from the Quran translated into English. It asks who could serve as an army to help besides God, describing disbelievers as being in a state of delusion. The passage emphasizes that only God, referred to as the Most Merciful, can truly help and that non-believers are mistaken in their understanding.
The document discusses how previous peoples denied Islamic teachings and faced rejection as a result. It encourages practicing and learning Islamic teachings to avoid facing the same fate, and reminds that Allah's rejection can be terrible for those who deny the teachings. The document repeats the phrase "Happy Land for Islamic Teachings" and contains a short verse highlighting how earlier peoples faced denial and Allah's reproach for rejecting Islamic teachings.
The document discusses a passage from the Quran about feeling secure from God's authority in heaven and warnings of being sent a storm of stones. It repeats the phrase "Happy Land for Islamic Teachings" between sections of the passage translated into English. The passage cautions those who feel secure from God's power in heaven by threatening a storm of stones so His warning is known.
The document provides a word-for-word translation of a passage from an Islamic text. The passage warns that one should not feel secure from God, who has authority in heaven, as He could cause the earth to swallow someone suddenly as it sways. The translation is repeated twice for practice.
The document contains an Arabic phrase translated to English questioning whether God, as the creator, would not know all things since He is subtle and aware. The phrase is presented twice in the document alongside mentions of "Happy Land for Islamic Teachings".
The document provides a word-for-word translation of a passage from the Quran. The passage advises that one can conceal their speech or proclaim it openly, as God knows what is in people's hearts regardless. This message is repeated several times throughout the document.
5. Advantages Disadvantages
They allow us to enter in correct The Qwerty and Dvorak
data, checking the monitor as we keyboards ease depends on the
go along user.
Data can be entered quickly It isn’t as quick as using a MICR or
OMR.
It is a strong device (Robust) Takes up space.
The concept keyboard can be of
particular use to people with
disabilities
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Devices
6. Advantages Disadvantages
They take up less space and Due to their small size,
are easy to carry around. entering the numbers may be
difficult.
Easier to hide them in case of
entering a PIN
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Devices
7. Advantages Disadvantages
It is faster to select an option using It is easy to damage them.
a mouse as opposed to a keyboard.
They increase the speed of It may be difficult for a person with
navigation disabilities.
They take up less space compared They take up more time if you were
to keyboards. to enter long passages of data.
Their purpose is to make choices
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from a menu; clicking.
Devices
8. Advantages Disadvantages
Like a mouse, it allows you May be found difficult for
to quickly chose an option. people to use.
Again like a mouse, it Difficult to control as they
allows quick navigation. are sensitive.
Hand no wire to them, built Again like a mouse,
into laptops. entering data with a lot of
words can be difficult and
time consuming. Back to Input
Devices
9. Advantages Disadvantages
Don’t require the same When a button is not present
amount of control as a mouse. to do a specific action is not
present, a problem arises.
Easier for people with Slower when selecting
disabilities options.
Accuracy of where the pointer
is on the screen can be
increased.
Fixed into position Back to Input
Devices
10. Advantages Disadvantages
Video date can easily be The video files occupy a
edited. lot of space.
The output can be A powerful computer
customized as to what and graphics card is
format you want it. necessary in order to
edit video files.
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Devices
11. Advantages Disadvantages
Can be various distances from the People suffering from RSI will not
device while still being able to find it easy to use.
operate it.
Beneficial to people who are unable Any obstruction in the pathway of
to walk with ease. the infrared signal from the remote
to the receiver could result in no
response from the device.
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Devices
12. Advantages Disadvantages
It is faster to choose an Like a mouse and tracker
option using a joy stick. ball, it is difficult to use
when it comes to typing
long passages.
Are able to control objects Difficulty may arise when
in 3D. trying to control the
pointer.
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Devices
13. Advantages Disadvantages
Faster entry of option Screen is flat so continual
use may result in RSI.
Much more easier to select
your option
Much user friendly for
people with disabilities
Less likely to select an
incorrect option. Back to Input
Devices
14. Advantages Disadvantages
Faster entry of data Damaged strip means that data entry
needs to be done manually, reducing
speed.
Data entry is accurate Loss of card could cause problems
such as no entry to restricted areas.
It is more secure
Can be used in security Back to Input
systems Devices
15. Advantages Disadvantages
Can be immediately updated If the card falls in the hands of a hacker,
they can access all your details and can
use it for identity theft.
Are less damaged than magnetic strip
readers due to regular use.
The data that is entered is more secure
than a magnetic strip
Security reasons: no entry without card. Back to Input
Devices
16. Advantages Disadvantages
It is very secure because it will If PIN is forgotten the card is
not work without the PIN almost useless; the transaction
gets cancelled.
Time effective : using cash or Great care must b taken when
cheques would require a longer entering the PIN.
time.
Chips are more indestructible
than magnetic strips.
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Devices
18. Advantages Disadvantages
Images can be stored and Limited Accuracy
then later be edited.
Using OCR saves time rather
than typing up the whole
document again
Easier to scan a bar code
rather than type it up.
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Devices
19. Advantages Disadvantages
Take a better quality picture Much more costly then traditional
cameras
Easier and quicker to get them onto Need to change the batteries more
the computer. often.
Quicker than having the film developed
And the amount of photo storage is
much greater Back to Input
Devices
20. Advantages Disadvantages
Sound can be altered whilst Voice recognition is not as
recording it. reliable as inputting text via a
keyboard.
It is much easier and much
faster to input text as speech.
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Devices
21. Click for:
Types of Sensors
How does a Sensor Work?
Advantages and Disadvantages
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Devices
22. • Used in automatic washing machines, automatic cookers,
Temperatu central heating and greenhouses.
re sensors
• Used in burglar alarms, automatic washing machines, and can
Pressure be used as a part of a robotic arm.
sensors
• Used in computer-controlled greenhouses, burglar alarm
Light systems, automatic washing machines and street lights.
sensors
Sound • Used in microphones and burglar alarm systems.
Sensors
Humidity • Used in computer-controlled greenhouses
Sensors
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Devices
24. Advantages Disadvantages
Readings that are taken by sensors are If there is a power failure, the sensor
much more accurate than human cannot work; therefore it is unable to take
readings. any readings.
The readings are taken at constant
intervals, allowing the microprocessor to
take immediate action.
Sensors are able to do all the calculations
or automatic processes while humans
perform other tasks.
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Devices
25. Advantages Disadvantages
Files that are produced can be It will not have the original touch
manipulated. of the music being played live.
“The music produced can sound
manufactured rather than
spontaneous.
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Errors can be omitted
Devices
26. Advantages Disadvantages
You can alter the drawing When choosing from a
whilst making it. menu, it could be difficult.
More accurate than using a More expensive than a
mouse mouse
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Devices
27. Advantages Disadvantages
Security is better than that of The amount of characters that
OCR’s can be used is limited.
Accuracy is better than that of Expensive
OCR.
Cheques can be read even
someone has written over
them.
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Devices
28. Advantages Disadvantages
Quick way of entering data Manual methods of marking
are more accurate.
More accurate than OCR’s Forms which can be
processed by OMR’s need to
planned with precision.
The user can easily fill in the
form that will be read by the
computer. Back to Input
Devices
29. Advantages Disadvantages
It is easier and faster to Errors are common.
enter data this way rather
than typing up the whole
thing.
Handwriting may not
always be recognised.
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Devices
30. Advantages Disadvantages
It increases the speed. You Expensive.
can scan the numbers on
the barcode rather than
typing them up.
It is also more accurate
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Devices
32. Advantages Disadvantages
Better than barcode readers as More expensive compared to
they still work when they are other methods.
intercepted.
Can be read from and also be There is a lack of privacy as it
written to. can be used to detect the
movement of people.
More difficult to copy as
opposed to a barcode.
Robust
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Devices
33. Can then be
Take moving Input to a Files are incorporated
pictures computer then stored into slideshows
or web pages.
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Devices
34. Advantages Disadvantages
Can quickly be turned on Limited facilities
Provide elders the opportunity to Not portable
stay in contact with their friends
and family.
Software is also limited.
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Devices
Editor's Notes
Ergonomic keyboards are now coming into common use due to the increase in number of people who use the computer. Their purpose is to prevent RSI whilst typing. This is aided by the shape of