Input and Output Devices

In this lesson, you will be introduced to the workings of input and output devices.

Input devices

An input unit is any device that retrieves data from the real world and converts it into binary data. A few examples of input units include:

  • A keyboard that converts character keys into ASCII or Unicode.

  • A video camera that converts light into pixelsIn digital imaging, a pixel, pel, or picture element is a physical point in a raster image, or the smallest addressable element in an all points addressable display device; so, it is the smallest controllable element of a picture represented on the screen..

  • A microphone that converts sound waves into electrical signals.

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