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Input Devices

  • They are used to feed data into a computer
  • The first step taken in producing information is feeding the necessary data into the computer.
  • The input devices are used to capture data and submit it to the central processing unit for processing.
  • Generally, data to be processed is collected from various internal and external terminals.
  • The various input devices are
    • Keyboard
    • Mouse
    • Scanner
Note: The other input devices are touch screens, trackballs, magnetic card reader and OCR devices.


  • The following figure shows a sample keyboard



  • A mouse is the standard tool for interacting with a graphical user interface.
  • It controls the movement of the cursor on the display screen.
  • It has a small ball inside which touches the pad through a hole at the bottom of the mouse.
  • When the mouse is moved, the ball rolls.
  • This movement of the ball is converted into signals and sent to the computer.
  • You need to click the button at the top of the mouse to select an option.
  • Mouse pad is a pad over which you can move a mouse.

Note: The Mouse of Apple computers has only one button.


  • It is an input device that allows information such as an image or text to be input into a computer.

  • It can read image or text printed on a paper and translate the information into a form that the computer can use.

  • It is used to convert images and text into a stream of data.

  • They are useful for publishing and multimedia application.

  • Scanners are of gray-scale and colour type.

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