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Peripheral devices

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Peripheral     devices Peripheral devices Presentation Transcript

  • PERIPHERAL DEVICES
  • PERIPHERALS  The term peripherals refers to all hardware devices that are attached to the computer and are controlled by the computer system  Peripherals can be classified into input devices and output devices.  Some can be both an input device and an output device
  • INPUT DEVICES  An input device is a piece of equipment that enables data to be entered into a computer for example:  Mouse  Keyboard  Joystick  Microphone  Digital Camera  Scanner
  • KEYBOARDS  The keyboard is made up of push-button switches which send a signal to the CPU each time you press them.  Keyboard standards vary with names like Deluxe, Natural and Cordless.
  • TYPES OF KEYS IN A KEYBOARD  Alphabet keys: ( A, B, : : : , Z).  Number keys: (1,2,3,….0)  Numeric Keypad: (numeric keys on right side).  Function keys: F1, F2, : : : on top row.  Special keys: Ctrl, Alt, Shift, backspace.  Arrow keys: Left, Right, Up, Down keys.
  • MOUSE  It is used to control the cursor or pointer on the screen and to give commands to the computer. It allows operations to be performed without having to remember complicated keyboard commands.  A roller mouse has a ball that is rolled as the mouse is moved about on the desktop.
  • Mechanical Mouse
  •  Optical mice use a light instead of a ball. Able to work on almost any surface without a mouse pad.
  • Cordless Mouse
  • Joystick A joystick looks like car’s stick shift. Controls objects on screen.
  • DIGITAL CAMERAS  Allow us to capture images and transfer them to a computer in the form of an image file.  Some digital cameras can capture small amounts of video.
  • SCANNERS  Scanner is a light sensitive device that helps you copy or capture images, photos, and artwork that exist on paper and converts it into digital form that can be processed and stored by the computer.
  • Webcam A webcam is a video camera that feeds its image to a computer or computer network. Their most popular use is the establishment of video links, permitting computers to act as videophones or videoconference stations
  • Microphone It is used as an audio-input device. The function of microphone is to enter/record sound into computer.
  • Bar Code Reader A barcode reader is an electronic device for reading printed bar codes. Bar code reader helps identify a product.
  • OUTPUT DEVICES  Output devices take information within your computer and present it to you in a form that you can understand Main output devices:  Monitors  Printers  Speakers
  • MONITORS  The monitor or visual display unit (VDU) is the most significant output device.  Desktop displays use a cathode ray tube (CRT)
  • LCD Monitor
  • PRINTERS  Laser – Expensive, used mostly in medium to large organizations
  • Ink Jet – Typically found in small businesses
  • Dot Matrix – Found mostly in large organizations for printing process reports and large volumes of data
  • PRINTERS  Speed – measured in Pages Per Minute (PPM)  Quality – measured in Dots Per Inch (DPI)  The higher the DPI the better the print quality
  • Speaker A speaker is a device that produces computer output in form of sound
  • Projectors A multimedia projector is a compact, high resolution, full-color projector capable of projecting text, images, video and audio content.
  • In class rooms