The word ‘ computer has been derived from the Latin word ‘computer’, which means ‘to calculate ‘.A computer is an electronic device that manipulates information or data according to the of instructions called programs. It has the ability to store, retrieve and process data .

1. INTRODUCTION
TO
COMPUTER

2. The word ‘computer’ has
been derived from the Latin
word ‘computer’ ,which
means ‘to calculate’. A
computer is an electronic
device that manipulates
information or data
according to the set of
instructions called
programs. It has the ability
to store, retrieve and
process data.
INTRODUCTION TO
COMPUTER

3. FUNCTION OF COMPUTER
 Input Information or data that is entered into a computer is called input. It sends
data and instructions to the central processing unit (CPU).
 Processing It is the sequence of actions taken on data to convert it into
information which is meaningful to the user.
 Output It makes processed data available to the user. It is mainly used to
display the desired result to the user as per input instructions.
 Storage It stores data and programs permanently. It is used to store
information during the time of program execution and possible to get any
type of information from it.

4. Features Of Computer
 Speed The computer can process data very fast at the rate of millions of
instruction per second .
 Accuracy Computer provide a high degree of accuracy. They respond to
the user as per the input instruction.
 Storage Capacity Computers are capable to store huge amount of data, which
depends on the capacity of hard disk.
 Versatility Computer can do different type of work simultaneously.
 Diligence Unlike human beings , a computer is from monotony, tiredness/ lack of
concentration, etc., and can work for hours without creating any errors.
 Secrecy Leakage of information is reduced by creating login system with
password protection.
 Reliability Computers are more reliable than human beings. Computer always
produce exact results.
 Plug and play Computers have the ability to automatically configure a new
hardware and software components.

5. COMPUTER HARDWARE
Computer hardware refers to the physical components of a computer that can be seen
and touched by the user.
Input Devices
An input device can be defined as an electro-mechanical device that allows the user to
feed data into the computer.
Keyboard
Keyboard is used to enter data or
information in a computer system,
which may be in numeric form or
alphabetic from, when key is pressed,
keyboard interacts with a keyboard
controller and keyboard buffer.
Keyboard controller stores the code of
pressed key in keyboard buffer.

6. Mous
e
Mouse is a small
handheld pointing device
having two buttons on its
upper side and also has
a small wheel I between
these buttons. It was
invented by Douglas
Engelbart at Stanford
Research centre in 1963.

7.  Biometric sensor
Biometric sensor is a device which recognises physical traits of the individual.
Biometric sensor s are used for marking attendance of employees/ student in
organisations / institutions.
Scanner
Scanner is an optical input device which uses light as an input source to
convert an image into an electronic from that can be stored on the
computer. It is used to convert the data and image on paper into the digital
from.

8.  Webcam (web camera)
It is a video capturing device. Webcam is a digital camera attached to
computer and can be used for video conferencing, online chatting, etc.
Webcam with
computer
Webcam
Now-a-days, webcams are either embedded into the display with laptop/ computer or
connected via USB or fire wire port or wi –fi to the computer

9. Printer
A printer prints
information and data
from the computer
onto a paper. It can
print documents in
colour as well as in
black and white. The
quality of a printer is
determined by the
clarity of the print.

10. Speaker
It is an output device that
receives sound in the from
of electric current. It needs a
sound card connected to a
CPU, that generates sound.
These are attached
internally or externally to a
computer system. These are
used for listening music, for
being audible in seminars
during presentations, etc.