Ppt lesson 05


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Ppt lesson 05

  1. 1. Unit 1—Computer Basics Lesson 5 Input, Output, and Storage
  2. 2. Objectives <ul><li>Identify and describe the most common input devices. </li></ul><ul><li>Identify and describe the most common output devices. </li></ul><ul><li>Identify and describe storage devices. </li></ul><ul><li>Identify and describe how input and output devices are connected to the computer. </li></ul>Computer Concepts BASICS -
  3. 3. Input and Output Devices <ul><li>Input devices enable a user to input data and commands to the computer to be processed. </li></ul><ul><li>Output devices enable the computer to give or show you the results of its processing. </li></ul><ul><li>Some devices can perform both input and output operations. </li></ul>Computer Concepts BASICS -
  4. 4. Input Devices—The Keyboard <ul><li>The keyboard is the most widely used input device. </li></ul><ul><ul><li>As you press keys on the keyboard, an electrical signal representing that key is sent to the computer. </li></ul></ul><ul><ul><li>Keyboards are divided into sections. </li></ul></ul>Computer Concepts BASICS -
  5. 5. Input Devices—The Keyboard (cont.) <ul><li>Typewriter keys: The standard alphabetic and numeric characters you would find on a typewriter </li></ul><ul><li>Function keys: Special keys that perform some specific function for the application being run </li></ul><ul><li>Numeric keypad: Used for mathematical operations </li></ul><ul><li>Directional keys: Used to move the cursor around the screen </li></ul>Computer Concepts BASICS -
  6. 6. Input Devices—The Mouse <ul><li>The mouse is a pointing device that rolls around on a flat surface and controls the location of the pointer on the screen. </li></ul><ul><li>The mouse performs the following functions: </li></ul><ul><ul><li>Pointing: Placing the on-screen pointer at a specific place </li></ul></ul><ul><ul><li>Clicking: Pressing and releasing the mouse button </li></ul></ul>Computer Concepts BASICS -
  7. 7. Input Devices—The Mouse (cont.) <ul><li>Mouse functions (cont.) </li></ul><ul><ul><li>Dragging: Holding down the mouse button and dragging an object to a new location by dragging the mouse </li></ul></ul><ul><ul><li>Double-clicking: Pressing and releasing the mouse button twice very quickly </li></ul></ul><ul><ul><li>Right-clicking: Pressing the right mouse button </li></ul></ul>Computer Concepts BASICS -
  8. 8. Other Pointing Devices <ul><li>Other devices that control the on-screen pointer: </li></ul><ul><ul><li>Trackball: This is like a mouse turned upside down. You roll a ball around with your fingers to control the location of the pointer. </li></ul></ul><ul><ul><ul><li>These frequently are found on notebook computers. </li></ul></ul></ul>Computer Concepts BASICS -
  9. 9. Other Pointing Devices (cont.) <ul><ul><li>Joystick and wheel: Joysticks consist of a metal or plastic handle mounted on a base that you can move in any direction to move the pointer or other object. </li></ul></ul><ul><ul><ul><li>These typically are used for video games. </li></ul></ul></ul><ul><ul><ul><li>Most have buttons that can be pushed or clicked to control input/output. </li></ul></ul></ul>Computer Concepts BASICS -
  10. 10. Other Input Devices <ul><li>Pointing stick: A pressure-sensitive device that resembles a pencil eraser; found mostly on notebook computers </li></ul><ul><li>Graphics tablet: A flat drawing surface connected to the computer </li></ul><ul><ul><li>The user draws on the surface, and the figures or writing on the tablet can be input to the computer for processing. </li></ul></ul>Computer Concepts BASICS -
  11. 11. Other Input Devices (cont.) <ul><li>Touch display: Screens that contain pictures or shapes that the user can press to input that data </li></ul><ul><li>Stylus/digital pen: Used with mobile devices to input data </li></ul><ul><li>Touchpad: Used mostly in laptop/notebook computers </li></ul>Computer Concepts BASICS -
  12. 12. Other Input Devices (cont.) <ul><li>Audio/voice input: Inputting sound and/or voice </li></ul><ul><ul><li>These usually require a microphone and special voice recognition software to be installed on the computer. </li></ul></ul>Computer Concepts BASICS -
  13. 13. Other Input Devices (cont.) <ul><li>Scanners: Devices that can convert a graphical image into a digital image and input it to the computer </li></ul><ul><ul><li>Types of scanners include </li></ul></ul><ul><ul><ul><li>Image scanners for scanning images and text </li></ul></ul></ul><ul><ul><ul><li>Bar code scanners to read product bar codes </li></ul></ul></ul><ul><ul><ul><li>Magnetic scanners to read the magnetic strip on a credit card </li></ul></ul></ul>Computer Concepts BASICS -
  14. 14. Other Input Devices (cont.) <ul><li>Digital cameras: Used to take pictures and store them on a magnetic disk instead of on film </li></ul><ul><ul><li>Their images can be input directly into the computer. </li></ul></ul><ul><li>Video input: Input from a camcorder or VCR using video capture cards </li></ul>Computer Concepts BASICS -
  15. 15. Other Input Devices (cont.) <ul><li>Biometric input: Uses fingerprint, face, handwriting, and voice for identification </li></ul>Computer Concepts BASICS -
  16. 16. Magnetic Storage Devices <ul><li>Floppy disks: Small, portable disks that hold a limited amount of data </li></ul><ul><li>Hard disks: Large-capacity and fast-access storage devices </li></ul><ul><li>Zip disks: Auxiliary storage devices that can hold large quantities of data and can be portable </li></ul><ul><li>Magnetic tape drives: Used for making system backups and storing large quantities of data </li></ul>Computer Concepts BASICS -
  17. 17. Optical Storage Devices <ul><li>CD-DA: Audio CD </li></ul><ul><li>CD-R: This drive allows you to read and to write to a compact disk </li></ul><ul><li>CD-ROM: Can hold large amounts of data, but is read-only access </li></ul>Computer Concepts BASICS -
  18. 18. Optical Storage Devices (cont.) <ul><li>CD-RW: Can be written on several times </li></ul><ul><li>DVD-ROM: Read-only DVD format </li></ul><ul><li>DVD-R: Similar to CD, but holds more data; read-only </li></ul><ul><li>DVD-RW: Can be written on several times </li></ul><ul><li>PhotoCD : Used for storing digital photographs on a CD </li></ul>Computer Concepts BASICS -
  19. 19. Solid-State Storage Media <ul><li>Non-volatile removable media </li></ul><ul><li>Miniature mobile media </li></ul><ul><ul><li>Uses integrated circuits </li></ul></ul><ul><li>USB flash drive </li></ul><ul><ul><li>Connects to the computer via a USB port </li></ul></ul>Computer Concepts BASICS -
  20. 20. Caring for Storage Media <ul><li>To safeguard your data from damage, follow these tips when dealing with removable media: </li></ul><ul><ul><li>Keep away from magnetic fields. </li></ul></ul><ul><ul><li>Avoid extreme temperatures. </li></ul></ul><ul><ul><li>Never try to disassemble the case. </li></ul></ul><ul><ul><li>Remove media from drive when not being used. </li></ul></ul>Computer Concepts BASICS -
  21. 21. Caring for Storage Media (cont.) <ul><li>Tips for dealing with storage media (cont.) </li></ul><ul><ul><li>Write-protect important data. </li></ul></ul><ul><ul><li>Hold optical disks at their edges. </li></ul></ul><ul><ul><li>Never remove the media from the drive if the access light is on. </li></ul></ul><ul><ul><li>Keep disks in a sturdy case when transporting them. </li></ul></ul>Computer Concepts BASICS -
  22. 22. Output Devices—Monitors <ul><li>Monitors are used to display video output to a user. </li></ul><ul><li>Monitors may be monochromatic or color. </li></ul><ul><ul><li>Monochromatic monitors display output in a single-color display. </li></ul></ul>Computer Concepts BASICS -
  23. 23. Output Devices—Monitors (cont.) <ul><li>Factors that influence the quality of a monitor </li></ul><ul><ul><li>Screen size: The diagonal measurement in inches of the display area </li></ul></ul><ul><ul><li>Resolution: The number of pixels that can be displayed in the display area </li></ul></ul><ul><ul><li>Dot pitch: The distance between each pixel in the display area </li></ul></ul>Computer Concepts BASICS -
  24. 24. Typical Computer Monitor Computer Concepts BASICS - This figure shows a typical computer monitor on a swivel stand that can be adjusted for viewing comfort. LCD Gas plasma
  25. 25. Output Devices—Printers <ul><li>Printers are used to create a hard copy of a document or image. </li></ul><ul><ul><li>Printers vary by speed, quality, and price. </li></ul></ul>Computer Concepts BASICS -
  26. 26. Output Devices—Printers (cont.) <ul><li>The most popular types of printers are </li></ul><ul><ul><li>Laser: Produce images using the same techniques as copier machines </li></ul></ul><ul><ul><li>Ink jet: Use fine nozzles to spray ink onto the page as the paper passes through </li></ul></ul><ul><ul><li>Dot matrix: Work similarly to a typewriter in that ink is transferred to the paper by some part of the printer striking a ribbon to transfer an image </li></ul></ul>Computer Concepts BASICS -
  27. 27. Laser Printer Computer Concepts BASICS - This figure provides an overview of a laser printer.
  28. 28. Ink Jet Printer Computer Concepts BASICS - This figure provides an overview of an ink jet printer.
  29. 29. Other Types of Output Devices <ul><li>Speakers and headsets </li></ul><ul><li>Fax machines and fax modems </li></ul><ul><li>Multifunctional devices </li></ul><ul><ul><li>Contain a variation of output options </li></ul></ul><ul><li>Data projectors </li></ul>Computer Concepts BASICS -
  30. 30. Connecting I/O Devices to the Computer <ul><li>Input and output devices must be connected to the computer before they can be used. </li></ul><ul><li>Connecting I/O devices to the computer: </li></ul><ul><ul><li>Plug the device into an existing socket or port on the back of the computer. </li></ul></ul><ul><ul><li>Install an expansion card with the port you need included on the back of the card. </li></ul></ul><ul><ul><li>Connect wirelessly. </li></ul></ul>Computer Concepts BASICS -
  31. 31. Summary <ul><li>Input devices enable you to input data and commands into the computer. </li></ul><ul><li>The most common input devices are the keyboard and mouse. </li></ul><ul><li>Other types of input devices include trackball, joystick and wheel, pointing stick, graphics tablet, touch display screen, stylus, voice recognition devices, touchpad, scanner, digital camera, video input, and biometric input. </li></ul>Computer Concepts BASICS -
  32. 32. Summary (cont.) <ul><li>To maintain a permanent copy of data, you should store it on some type of storage medium. </li></ul><ul><li>The three categories of storage media are magnetic storage, optical storage, and solid-state storage. </li></ul><ul><li>Monitors and printers are examples of output devices. </li></ul>Computer Concepts BASICS -
  33. 33. Summary (cont.) <ul><li>Monitors produce soft copy. </li></ul><ul><li>Printers are used to produce a paper or hard copy of the processed result. </li></ul><ul><li>Criteria for selecting a printer include speed, print quality, and cost. </li></ul><ul><li>Input and output devices must be physically connected to the computer. </li></ul>Computer Concepts BASICS -
  34. 34. Summary (cont.) <ul><li>Some input devices communicate with the computer through a physical connection. </li></ul><ul><li>Wireless devices communicate with the computer through infrared or radio waves. </li></ul>Computer Concepts BASICS -