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Computer Input and Output

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BY- BIBHUDENDRA SARANGI

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Introduction

This presentation aims to:

  • briefly explain what computer input and output is
  • examine some of the more commonly used input and output devices to help understand these concepts.

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Input

  • Input is any data or instruction that is entered into the computers memory.

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  • Input devices are the hardware components that you use to enter the data or instructions into the computer.

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Output

  • Output is a result of:
    • inputting data into the computer
    • the computer processes the data
    • the computer sends out the processed information by means of an output device
  • Output can be displayed:
    • on screen,
    • printed out,
    • in the form of graphics, or
    • voice or sound output.

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Devices �

  • Input Devices

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  • Keyboard
  • Scanner
  • Microphone
  • Digital camera
  • Barcode Reader
  • Optical Mark reader

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  • Output Devices

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  • Computer screen
  • Speakers
  • Printer
  • Projector

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�These are just a few of the input and output devices you may recognise

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Keyboard

  • A particular key is pressed, sending an electronic signal to the computers ‘brain’.

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  • The computers ‘brain’ interprets the signal.

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  • The computer sends back a particular letter or character which represents the signal that the computer has interpreted.

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Scanner

  • Scans a picture or text.

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  • Translates information into a form the computer can understand.

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This information can then be

    • displayed on the computer screen
    • stored to a file
    • used in computer documents

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Computer Screen

  • The most obvious and useful output device, displaying text and graphics as you are working on them.

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  • Can display still or moving images.

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Speakers

  • Speakers output sound from your computer.

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  • The speakers take the electronic signals stored on things like CD’s and DVD’s and and send them out as the sound we can hear.

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Printer

  • This device is used for outputting text or images onto paper.

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  • Different kinds of printers produce different quality output.

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  • Laser and ink-jet printers produce

the highest quality documents.

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To Summarise…

  • Machines that let you enter data are input devices

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  • Machines that show you the data in a form you can understand are output devices.

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