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Submitted By

2. Input Devices
• Parts of Computer, which are used to feed
data and commands are called Input
Devices .
Some Input Devices are:
 Keyboard
 Mouse
 Joy Stick
 Scanner
 Touch Screen

3. Keyboard
 Keyboards are input devices.
It is used to type words,
numbers, and symbols in the
computer.
 The keys on the keyboard
can be classified as follows:
 Alphabetic keys
 Numeric keys
 Function keys
 Symbols keys
 Special keys

4. Mouse
• Mouse is a pointing
device which is used to
draw, move and resize
the picture and words.
• It has a small ball
inside ,which when
rolls ,moves the
rollers ,which move the
pointer on the screen of
monitor.
• It has two buttons on
the top .

5. Joystick
• A joystick consists of
vertical bar.
• It can be rotated in
various directions.
• This rotation moves the
cursor to the desired
position.
• It contains various
buttons for various
functions.

6. Scanner
• A Scanner is an input
device. It is used to
make an exact copy of
text or a picture and
send them to the
computer .
• Computer scanners are
used to scan images,
including documents
and photos.

7. Touch Screen
• Touch screens only needs
a finger touch to supply
input to the system, rather
than typing on keyboard or
pointing with a mouse.
• It is a selection of
processing options that are
represented with graphical
icons.

8. Output Devices
• An output device is any
piece of computer
hardware equipment
used to communicate
the results of data
processing carried out
by an information
processing system
(such as a computer) to
the outside world.
The output devices are:
•
•
•
•
•
•
Monitor
Speaker
Headphone
Printer
Plotter
Projector

9. Monitor
• The monitor displays
the video and graphics
information generated
by the computer
through the video card.
• Monitors are very
similar to televisions but
usually display
information at a much
higher resolution.

10. Speaker
•
Speakers enable the
computer to output sound
through speakers.
•
Speakers are required to
listen to music and video
CD/DVD sound.
•
This also allow us to listen
to the computer generated
sound. Some monitors have
built in speakers.

11. Headphone
• Headphones give sound
output from the
computer.
• They are similar to
speakers, except they
are worn on the ears so
only one person can
hear the output at a
time.

12. Printer
• A printer is a device that
prints text or illustrations on
paper.
• There are many types of
printers an they are:
 Daisy-wheel
 Dot-Matrix
 Ink-Jet printer
 Laser
 LED
 Thermal

13. Plotter
• Plotters are similar to the
computer printers. It is used
to draw pictures on paper
based on commands from a
computer.
• Plotters differ from printers
in that they draw lines using
a pen.
• They can produce
continuous lines. Plotters are
used in engineering
applications. They are more
expensive than printers.

14. Projector
• A projector is a device
that enables an image,
such as a computer
screen, to be projected
onto a flat surface.
• These devices are
commonly used in
meetings and
presentations as they
allow for a large image to
be shown so everyone in
a room can see.