PDF GCSE Computer Science - Fairwater High School

Revised: November 2013

GCSE Computer Science

2013

Geraint D. Jones

Mark D. Thomas

Disclaimer

This resource is provided to support the teaching and learning of GCSE Computer Science. The materials provide an introduction to the main concepts of the theory of the subject and should be used in conjunction with other resources and sound classroom teaching. It is intended that the resource will be updated periodically due to the evolving nature of the subject. Suggestions as to how the materials may be developed further are welcome through our feedback system or by sending an e-mail to: resources @wjec.co.uk

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Contents

Computer systems...................................................................... 4 Data representation ................................................................. 20 Computer system ..................................................................... 35 Networks .................................................................................. 43 The Internet and communications........................................... 53 Algorithms ................................................................................ 62 Programming ............................................................................ 63 Ethical, social, and legal aspects .............................................. 70

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I. Computer systems

CAN YOU IDENTIFY AND DESCRIBE COMPUTER SYSTEMS?

CPU

You should be able to: identify and describe computer systems: o CPU o input devices o output devices o backing storage o data bus o address bus o ports and connectivity

ALU

registers controller internal memory

The CPU (Central Processing Unit) is the main component in a computer for processing data and instructions. It could be considered as the computing equivalent of the human brain. It is a hardware device that is made up of many sub components:

controller ALU: arithmetic/logic unit registers internal memory buses

All of these components have their own specific function. These are discussed in further detail on page 7.

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Input devices

An input device allows data, such as text, images, video or sound, to be entered into a computer system. Some common hardware input devices are shown below:

graphics tablet

mouse

keyboard

microphone

Output devices

There are many outputs created by a computer system. These include printed document, on-screen data, sound. An output device allows data to be communicated by the computer in a human-friendly form, for example, sound being output by a speaker. Some common hardware output devices are shown below:

speakers

projector

monitor

printer

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