The document discusses various input and output devices used in computers. The main input devices described are the keyboard, mouse, joystick, scanner, and touch screen. The keyboard is used to type text, the mouse is a pointing device, the joystick controls cursor movement, scanners are used to input images, and touch screens use finger touches. The main output devices covered are the monitor, speakers, headphones, printer, plotter, and projector. The monitor displays visual output, speakers and headphones provide audio output, printers produce hard copies of documents, and projectors are used to project computer displays onto surfaces for presentations.

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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.