Unit 3: Computer Systems

OCR Level 3Cambridge Technicals

in IT

Do you know what’s under the bonnet of a

car?

What’s under the What’s under the bonnet?bonnet?

What’s under the What’s under the bonnet?bonnet?

Do you know what’s inside

your computer?

Like a car, you can open it up and see what’s

inside that makes it work

So what’s really inside?So what’s really inside?

CPU: microprocessor able to carry out

calculations

Motherboard: the foundation for all the other

components

Sound and graphics cards: enable your

computer to play sounds and display graphics

Storage drives: hard drive, solid state (no moving parts), optical

storage (CD/DVD ROM)

Memory: ROM (read only) and RAM (which the

computer can write to)

With a car, you can add parts to make it look better or go faster….

Is that enough?Is that enough?…with a computer you can add different

chips, cards, software or hardware to improve its performance.

What will you learn?What will you learn?After completing this unit you will:

Understand the components of

computer systems

Be able to recommend

computer systems for a business

purpose

Be able to set up and maintain

computer systems

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