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Input and output devices ppt


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Input and output devices ppt

  1. 1. • Input device captures information and translates it into a form that can be processed and used by other parts of your computer. Keyboards Pointing devices Game controllers Scanners Styluses Microphones Digital cameras Web cams
  2. 2. The keyboard is the most common input device. Types of keyboards include: • Wireless • Multimedia and one-touch access • Portable keyboards for PDAs
  3. 3. Pointing devices are mainly used to choose and enter commands Pointing devices tend to have PS/2 connectors or USB connectors • PS/2 connector fits into a PS/2 port, which a small round socket with small holes that fit the pins on the connector • USB connectors fit into USB ports, and these are small rectangular openings on the back or front of your computer, or even on your keyboard or monitor
  4. 4.  Various pointing devices are available  Types of pointing devices: • Mouse Mechanical mouse Optical mouse Wireless mouse • Trackball • Touchpad • Pointing stick
  5. 5. Game controllers are used mainly to play games Types of gaming devices • Gamepads • Joysticks • Gaming wheels • Force feed
  6. 6. Other types of input devices include: • Scanners • Styluses • Microphones • Digital cameras • Web cams
  7. 7. •Scanner is a light sensitive device that helps you copy or capture images, photos, and artwork that exist on paper. Types of scanners include: Flatbed
  8. 8. • Stylus is an input device consisting of a thin stick that uses pressure to enter information or to click and point • Styluses are used with: PDAs Tablet PCs Graphics tablets
  9. 9. • Microphones are used to input audio • Three main types of microphones are: Desktop microphones Headsets Directional microphones • Speech recognition is increasingly being included in application software
  10. 10. 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
  11. 11. Devices with flat-panel displays • Tablet PCs • PDAs • Cellular phones • Desktop computers
  12. 12. CRTs Flat-panel displays Gas plasma LCD (liquid crystal display) Passive matrix Active matrix Called TFT (thin film transistor) Separate transistor for every pixel
  13. 13. Screen size measured as a diagonal line across the screen – from corner to opposite corner Resolution the number of pixels displayed on the screen (the higher the resolution, the closer together the dots) Pixels (or picture element) dots that make up the image on your screen Dot pitch is the distance between the centers of a pair of like-colored pixels Refresh rate the speed with which a monitor redraws the image of the screen, and is measured in hertz
  14. 14. Inkjet – most popular Makes images by forcing droplets through nozzles Top speed is 20 pages per minute Laser Forms images using an electrostatic process Prints between 3 and 30 pages per minute
  15. 15. Resolution of a printer is the number of dots per inch (dpi) it produces. Higher the resolution, better the image, and usually the more costly the printer
  16. 16. Multifunction printer: • Scan, copy, fax, and print • Can be either inkjet or laser • Cost less than buying individual units • Take up less desk space
  17. 17. A speaker is a device that produces computer output as sound Speakers are common devices in computer systems Examples include: • Built-in speaker • Two-device set speakers • Surround sound speakers