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Subject: Computer
chapter: about computer
ABACUS
Who invented the computer?
 Charles Babbage
 He is know as Father
of computer science.
Computer
A Desktop Computer
Monitor
CPU
(System Unit)
Keyboard
Mouse
Computer
A Laptop Computer
Where
Is
The
Mouse?
Monitor
(Display Screen)
CPU
(System Unit)
Keyboard
Touch Pad
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.
Concept of computer
Concept of computer
How computer works
Input Process Output
3,6,4 3+6+4 13
A Computer is an electronic
machine that takes input, processes
the input And gives us meaningful
result.
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)
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 )
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.
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.
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.
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.
Home
School
Office Shop
Hospital
Bank
Library
Computer
Lab
• 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
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.
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.

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Concept of computer

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