1. By : Keshavi Aggarwal
Class: IX-C
Roll No.: 17

2.  INTRODUCTION ON COMPUTER
 COMPONENTS OF COMPUTER
 INPUT DEVICES
 PROCESSOR (CENTRAL PROCESSING UNIT)
 OUTPUT DEVICES
 STORAGE OR MEMORY UNIT

3.  Now-a-days computer is playing a main
role in everyday life as it has
become the need of people just like
television, telephone or other
electronic device at home.
Technically , a computer is a
programmable machine. This means it
can execute a programmed list of
instructions and respond to new
instructions that are given. Today
the term is most often used to refer

4.  INPUT DEVICES
 PROCESSOR (CENTRAL PROCESSING UNIT)
 OUTPUT DEVICES
 STORAGE OR MEMORY UNIT

5.  The input is first given to the processor by
input devices . These devices which supply the
feed or information to the main machine , i.e.
the CPU , for the beginning of the IPO cycle is
called an input devices . Some input devices
are:
 Keyboard
 Mouse
 Scanner
 Digital camera
 Microphone
 Tablet
 Light pen
 Joystick
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6.  After the input is received ,
it goes to the processing unit
. The central processing unit
is called CPU , processer or
microprocessor. It is also
known as brain of the computer.
The CPU is the device that
receives various types of input
and produces output. The CPU
has 3 major parts. They are:
control unit(CU), Arithmetic
and Logic unit(ALU), and Memory
unit(MU).

7.  The various parts of the computer’s CPU
is directed by control unit. The control
unit can be described as the manager of
the CPU. It’s sole purpose is to guide
other mechanisms in the system to
complete specific tasks. The control
unit fetches instructions from memory
and decodes them to produce signals
which controls the other parts of the
computer. These signals cause it to
transfer data between memory and ALU to
activate peripherals to perform input or
output.

8.  Ii is one of the most important part
of computer’s CPU . It comprise of
electronic circuits that make it
capable of executing arithmetic and
logic operations. It has a ability to
perform 4 types of functions:
addition, subtraction, multiplication
and division. It can also perform 3
logical operations: equal-to, less-
then and greater-then.
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9.  It is a part of the computer in which
information is stored for the central
processing unit. A computer consists
of two types of memory: RAM and ROM.

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RAM ROM
It stands for
Random Access
Memory.
It stands for Read
Only Memory.
It can be edited. It can only be
viewed it cannot
be edited.

10.  After the processing is done , the
result is finally displayed on the
output device. The devices which puts
the result of the input given by the
user after the processing is done is
called as output device. It is also a
device which communicates the result of
data processing. Some output devices
are:
 Monitor
 Printer
 Speaker 3

11.  Storage devices are use to hold
information.
 Different storage devices are:
1. Hard disc drive: the place where the
files are permanently stored. The
operating system is installed here.
2. CD-ROM drive: these are use to store
large amount of data.
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12. 3.Floppy drive: it is a small disc
storage device which has 1.4
megabytes of capacity
4. DVD drives: it stores a large amount
of
data, which is much more than the
capacity of CD.
5. Memory stick/ pen drives: they are
small in size but can hold a good
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