1. introduction to computers

2. What is a computer?
A piece of equipment that can be programmed (instructed) to perform a certain functions.
It processes data quickly and accurately.
Able to process, store, input and output data or information.

3. What does a computer look like?

4. Characteristics of a computer
An automatic machine.
Processes data quickly and accurately.
It has no feelings or emotions like human beings.
It can recall any stored information when needed.
It cannot think on its own, but follows instructions.
It has a storage capacity for storing data and instruction.

5. Types of Computers
Special-purpose computers
General-purpose computers

6. Special-purpose computers
Designed to do a specific job
Usually expensive
E.g. ATM, computers in aircrafts, MRT trains, traffic light system and etc.

7. General-purpose computers
Designed to do many kinds of jobs for e.g. Surfing the web, Word processing and etc.
Usually cheaper
E.g. Personal computers, notebooks

8. Task of a general-purpose computer
Performs calculations
Send messages
Write documents
Draw graphics
Surf the net

9. What is a program?
A set of instructions for the processor to complete a job
Created by programmers
All programs are software

10. Types of software Two types: 1. System software
2. Application software

11. System Software
The Operating System (OS) and utilities that enable the computer to function
Examples:
OS – Windows XP
Utilities – McAfee Antivirus

12. Application Software Programs that users use to do work. Examples:
Word Processors – Microsoft Word
Spreadsheets – Microsoft Excel
Database Management Systems – Microsoft Access