1. 1.1 How Does a Computer Work?
Every computer operation can be divided into three stages: input, process and output.
Input, process and output

2. 1.1 How Does a Computer Work?
Example of ‘input  process  output’
A student working on a worksheet
Washing clothes by a washing machine

3. 1.1 How Does a Computer Work?
‘Input  process  output’ represents the three stages of a computer operation process.
Input
Enter data and
command into a
computer.
Process
The computer
works on the
data.
The computer
shows the
processed results.
Output
Three stages of a computer operation process

4. 1.1 How Does a Computer Work?
‘Input  process  output’ represents the three stages of a computer operation process.
Input
Enter data and
command into a
computer.
Process
The computer
works on the
data.
The computer
shows the
processed results.
Output
Three stages of a computer operation process

5. 1.2 What are the Components of a Computer System?
Hardware
the physical part of a computer system
includes a system unit and a number of external devices attached to it
Software
a sequence of instructions
command the computer system to complete specific tasks

6. 1.2 What are the Components of a Computer System?
Hardware
composed of input devices, a system unit, output devices

7. 1.2 What are the Components of a Computer System?
Input devices
for entering commands or data into the computer
A microphone
A mouse
A keyboard
A scanner

8. 1.2 What are the Components of a Computer System?
System unit
contains a central processing unit (CPU), circuit boards, a power supply and storage devices
works on data together with the software to produce processed results
System unit

9. 1.2 What are the Components of a Computer System?
Output device
The processed result can be displayed to users by different output devices.
A printer
A monitor
Speakers

10. 1.2 What are the Components of a Computer System?
Software
Software can be classified into two types: system software and application software.

11. 1.2 What are the Components of a Computer System?
System software
manages the operations of computer hardware
helps us operate the computer system easily
controls and facilitates the execution of the application software
Macintosh Operating System
Microsoft Windows XP

12. 1.2 What are the Components of a Computer System?
Application software
carries out specific tasks for the user
application software cannot be run on a computer system without the presence of an operating system

13. 1.2 What are the Components of a Computer System?
Relationship between software and hardware

14. Type of application software
1.2 What are the Components of a Computer System?
Type of application software
Function
Example
Word processor
Create, edit, format, save and print documents.
Microsoft Word
Spreadsheet
• Perform calculation and data manipulation.
• Create charts.
Microsoft Excel

15. Type of application software
1.2 What are the Components of a Computer System?
Type of application software
Function
Example
Presentation software
Create presentations and slide shows.
Microsoft PowerPoint
Image editing software
Edit photos and graphics.
Ulead Photolmpact

16. Type of application software
1.2 What are the Components of a Computer System?
Type of application software
Function
Example
Communication software
Exchange messages between
different computers.
Microsoft Outlook

17. Type of application software
1.2 What are the Components of a Computer System?
Type of application software
Function
Example
Communication software
Exchange messages between
different computers.
Microsoft Outlook