Computer Input and Output

1
Computer Input and Output

• Dairne Jesperson
• Charles Darwin University

2
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.

3
Input

• Input is any data or instruction that is entered
  into the computers memory.
• Input devices are the hardware components that
  you use to enter the data or instructions into
  the computer.

4
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.

5
Devices
These are just a few of the input and output
devices you may recognise

• Input Devices
• Keyboard
• Mouse
• Scanner
• Joystick
• Microphone
• Digital camera

• Output Devices
• Computer screen
• Speakers
• Printer

6
Keyboard

• A particular key is pressed, sending an
  electronic signal to the computers brain.
• The computers brain interprets the signal.
• The computer sends back a particular letter or
  character which represents the signal that the
  computer has interpreted.

7
Mouse

• Controls the movement of the cursor on the screen
  as you move the mouse, the cursor moves in the
  same direction.
• Useful in graphics programs where you can draw
  pictures by using the mouse as a pen or
  paintbrush.
• So called because of its shape the wire
  connecting it to the computer being its tail.

8
Scanner

• Scans a picture or text.
• Translates information into a form the computer
  can understand.
• This information can then be
• displayed on the computer screen
• stored to a file
• used in computer documents

9
Computer Screen

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

• Can display still or moving images.

10
Speakers

• Speakers output sound from your computer.
• The speakers take the electronic signals stored
  on things like CDs and DVDs and and send them
  out as the sound we can hear.

11
Printer

• This device is used for outputting text or images
  onto paper.
• Different kinds of printers produce different
  quality output.
• Laser and ink-jet printers produce
• the highest quality documents.

12
To Summarise

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