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Input and Output Devices

This lesson explains the difference between input and output devices and gives the common examples you need to know. You will also see how sensors act as input devices in monitoring and control systems.

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Input versus output

ComputerprocessesInpute.g. keyboardOutpute.g. monitordata indata outa touch screen can do both
  • An input device sends data or instructions into a computer system for it to process.
  • An output device receives data from the computer and presents it to the user in a form they can understand or use.
  • For example, a keyboard is an input device because it sends key presses to the computer, while a monitor is an output device because it displays results.
  • Some devices, such as a touch screen, can act as both an input and an output device at the same time.

Check you've got it

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1. Which statement correctly describes an output device?

2. A supermarket checkout needs to read the price code printed on each item quickly. Which input device is most suitable?

3. Which output device would be used to produce movement, such as opening a valve in a control system?

4. In an automatic greenhouse control system, what is the role of the sensors?

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