The document provides an overview of computers including who invented them, how they work, their basic components, and characteristics. It discusses that Charles Babbage invented the computer and is known as the Father of Computer Science. It describes how computers work using the basic input-processing-output model and takes data as input, processes it, and provides output. Key characteristics of computers mentioned are their high speed, accuracy, diligence, versatility, high storage capacity, and ability to communicate. The document also differentiates between machines and devices.

1. Welcome !
Subject: Computer
chapter: about computer

2. ABACUS

3. Who invented the computer?
 Charles Babbage
 He is know as Father
of computer science.

4. Computer
A Desktop Computer
Monitor
CPU
(System Unit)
Keyboard
Mouse

5. Computer
A Laptop Computer
Where
Is
The
Mouse?
Monitor
(Display Screen)
CPU
(System Unit)
Keyboard
Touch Pad

6. How does a computer work?
1.A computer works in three basic steps
called as input- processing-output.
A. Takes Data and instruction as input
B. Process the input
C. Gives the output
2. IPO is the basic working principle of all
the computers.

9. How computer works
Input Process Output
3,6,4 3+6+4 13

10. A Computer is an electronic
machine that takes input, processes
the input And gives us meaningful
result.

11. Characteristics of a computer
High speed
A computer can work very fast. Computer can
process a million of data within a fraction of
second.
The processing speed of computer is measured
in Mega hertz ( MHz) or Giga hertz ( GHz)

12. Characteristics of a computer
Accuracy
A computer is an accurate machine because it
does not make any mistake. If the data and
instructions given to computer are correct, it
always gives correct result or output.
But if the data and instructions are incorrect
then output will be incorrect. It is know as
garbage in garbage out ( GIGO )

13. Characteristics of a computer
Diligent
A computer is a diligent machine because it
never gets tired or bored while working.
It can work for a long time without taking rest.
It can continuously work for long time without
creating any error.

14. Characteristics of a computer
Versatile
Versatile is most important feature of computer.
It can perform the several tasks such as
calculation, drawing pictures, playing games,
writing letters etc.

15. Characteristics of a computer
High storage capacity
A computer has a high storage capacity.
It can store large amount of data and programs
permanently for future use.

16. Characteristics of a computer
Communication
A computer is used for communication.
We can talk with people throughout the world by
using computers and the internet.

17. Home
School
Office Shop
Hospital
Bank
Library
Computer
Lab

18. • if we provide correct input to the computer, the
computer will give the correct output. if we give
wrong input to the computer. it will give the
wrong output that is known as GIGO.
CORRECT INPUT CORRECT OUTPUT
WRONG INPUT WRONG OUTPUT

19. Differences between machine and device
Machine
 A machine is anything that
makes work easier by
reducing cost, time and
human efforts.
 Every machine is a device.
 E.g.: Calculator, Watch,
Phone, scissor, knife, etc.
Device
 A device is part of
computer that performs a
special task.
 Every device is not a
machine.
 E.g. Printer, keyboard,
CPU etc.

20. Some tasks that we can perform using computer
1. We can write letters and send e –mail to friends.
2. We can listen music and watch movies.
3. We can store lots of data and information.
4. We can check our spelling of words.
5. We can do mathematical calculation.
6. We can draw and colors of pictures.
7. We can play games.
8. We can chat with friends through the internet.
9. We can study online class
10.We can read or listen news.