This document provides an overview of computers, including: - Different types of computers like mainframes, minicomputers, and microcomputers. It also discusses supercomputers. - The basic functions of computers including input, processing, and output. - Examples of input devices like keyboards, mice, and cameras. Output devices include monitors, printers, and speakers. - A classification of computers into analog, digital, and hybrid systems.

1. Presented by:Samina khan

2. COMPUTER WHIZ 4

3. Whiz’s File
 Chapter 1Reviewing computers
 Chapter 2Pioneers of Computers
 Chapter 3About the CPU
 Chapter 4Storing Data
 Chapter 5Whiz through Software
 Chapter 6Introducing Spreadsheet
 Chapter 7Programming Languages
 Chapter 8More on Multimedia
 Chapter 9Computer Networks

4. CHAPTER: 1
REVIEWING COMPUTERS
By :SAMINA KHAN

5. OVERVIEW
 Introduction to computer
 Kinds of computer
 Super computer
 Classification of computer
 Functions of computer
 Input devices
 Output devices
 Examples of input devices
 Examples of output devices

6. Introduction
 Comes from the word compute.
 It is an electronic machine.
 It is a fast machine
 Used for different purposes.
 Stores data.

7. Kinds of computer
 Mainframe computers
 Mini computers
 Microcomputers

8. Mainframe Computers
 Very large, powerful and expensive.
 Used in banks.
 Hundred of people can use it at a time.

9. Mini computers
 Large and expensive but not powerful.
 Fewer users can use it at a time.
 Used in medium sized companies.

10. Micro Computers
 Smallest and cheapest.
 Also called PC(Personal computer)
 Used in everyday life.

11. Super Computer
 Speed of calculation is fast.
 Made up of hundred or thousand
computers
 Used for weather forecasting, nuclear
research and scientific research.

12. CLASSIFICATION OF
COMPUTER

13.  Computers can also be classified as:
1. Analog computers
2. Digital computers
3. Hybrid computers

14. Analog Computers
 Works at an extraordinary speed
 Have limited memory
 Perform certain type of calculations
 Output is not precise

15.  Examples:
Car speedometer
Electricity meter
Gas meter

16. Digital computers
 Slower than analog
 Easy to program
 Result is precise
 Examples: All personal computers

17. Hybrid computer
 Have both features of analog and digital
 Used in medical field.

18. Functions of computer
1. Input
2. Processing
3. Output

19. Input
 Data that is entered into the computer
I entered a web
address into the
computer;
This is input

20. Processing
 CPU of the computer work with the
data. This is called processing
The computer is
connecting me to
web page;
This is processing.

21. Output
 Data that has been processed is called
output.
I can see the
web page on
monitor;
This is output.

22. Input & Output
Devices

23. Input Devices
 Devices that help us to enter data

24. Output Devices
 Devices that present processed data.

25. Different input and output
devices

26. EXAMPLES OF INPUT
DEVICES
 input devices are the keyboard, mouse,
microphone, scanner, digital camera .

27. EXAMPLES OF OUTPUT
DEVICES
 output devices are a printer, a monitor
and speakers.