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Computer skills level one Chapter 2. Hardware Components. Computers are made up of many components Most of these are internal . Some are connected externally ,using ports Components located outside the computer’s case are referred to as peripheral devices. PC ports.

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hardware components
Hardware Components

Computers are made up of many components

Most of these are internal .

Some are connected externally ,using ports

Components located outside the computer’s case are referred to as peripheral devices

computer components
Computer components

Computer components can be divided into the following categories:

the motherboard
The Motherboard

A motherboard (system board ) is a large printed circuit board with connection for all the other components in

the computer

The motherboard allows the components to exchange date

It also houses the power supply

The type of motherboard determines the types of CPU , memory and hard disk that can be installed in

the computer

The motherboard contains several slots that allow you to plug expansions cards into your computer

the system case
The system case

The motherboard and other internal components,

Usually made of metal and plastic

the central processing unit cpu
The Central Processing Unit (CPU )

CPU is the parts of the computer that processes and calculates data

You can think of the CPU as the brains of the computer

input devices
Input Devices

Used to supply information to a computer

Example :

Keyboard

Used text-based data input and for selecting commands

Mouse

Used to control the movement of the pointer on the screen

Trackball

Used as an alternative to a mouse

input devices1
Input Devices

Light pen

Hand-held device (very similar a standard ballpoint pen )

Scanner

Used to detect on paper (pictures or text )and then translate into computer data

Digital cameras

Work in much the same way as normal cameras except that the exposure from the subject is recorded onto light sensitive diodes not photographic film

The image is save to a flash memory card

output devices
Output Devices

Display information from the computer to the user

The main devices display data on a screen ,print data on paper ,and play data as sound

- Touch screen

- Digital projector

printers
Printers

Printer allows the user to print out on paper

Printers are available in both color and black and white

A color printer is more expensive then a black and white printer is.

laser printers
Laser Printers

A laser printer produces very high quality print and often quieter and faster than an inject or dubble –jet but they are expensive

sound input and output
Sound input and Output

Sound card and speakers

many computers ,especially home computer

equipped with speakers

Speakers take the signal generated by a sound card and convert it into sound