This document provides an overview of computers and how they work. It explains that a computer needs instructions to perform tasks as it does not have its own thinking capacity. The basic working principle of a computer is that it takes in data and instructions as input, processes the input, and provides output. Computers are characterized as having high speed, accuracy, diligence, versatility, high storage capacity, and communication abilities. It works through input, processing, and output and can perform many tasks quickly and accurately without tiring.

1. Online class
computer Science
Prepared by:
Jeevan Subedi

2. Computer
• A computer is an …………………………….

3. How Does a Computer Work?
Computer is a wonderful machine
that can perform several functions.
A computer does not have its own
thinking capacity. It needs
instructions to perform tasks.

5. Working principal of the computer
• Takes Data and Instructions as Input
• Processes the Input Data
• Gives the Output
Thus, Input Process Output is the basic working principle of
computer. All the computers perform any task according
to this basic principle.

6. Characteristics of Computer

7. Characteristics of Computer
 High Speed
 Accuracy
 Diligence
 Versatility
 High storage Capacity
 Communication

8. High Speed
A computer can work very fast. It is a very high speed
electronic device. The processing speed of computer is
close to the speed of light. This processing speed of
computer is measured in Mega Hertz (MHz) or Giga
Hertz (GHz) that is the speed of CPU.
Accuracy
A computer is an accurate machine. It does not
make any mistake. If the data and instructions
given to the computer are correct, it will always
gives correct result or output. If the input data
and instructions are incorrect then the output will
be incorrect. In computer terminology, it is known

9. 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
Versatile
Computer is a versatile machine. It is the most important
feature of computer. It can perform the several tasks
such as calculations, drawing pictures, playing game,
playing music, writing letters, sending e-mail, etc.

10. High Storage capacity
A computer has a high storage capacity. It has internal
storage (memory) as well as external or secondary
storage. The internal storage devices of computer are
RAM and ROM and the external storage devices of
computer are hard disk, CD-ROM, DVD, pen- drive etc.
Communication
Now- a- days computer is mostly used to exchange
messages or data through Internet
all over the world. With the help of computer