4. Input Devices
“An input device is a hardware component that alows the
user to enter data or instructions in to the computer”
The input devices are following:
It is the typye of input device which is most commonly
used.It consist of keys that is used to enter tha data in the
computer.A simple keyboard typically has 105 keys.There are
alphabet keys(A-Z),numerical(0-9),function keys(f1-f12),and
special symbol keys.
Uses of keyboard:
For typing purpose
For enter data or give instructions
For playing games
For operatingdifferent software
Mouse is a point and click input device with two or three
buttons.It controls the point or cursor on the display
Uses of Mouse:
For Playing games
Scrolling the page
Give command through click
Types of Mouse:
7. Mechanical Mouse:
A mechanical mouse has a
rubber ball on its underside.which rolls in all direction.It
contain a circuit to detect the movement.
Optical mouse uses Laser to dectate the
mouse movement.It responds more quickly.
It is also called a input device,which can be used to
record sound into the computer system.Mic is specially
used for voice chatting,recording and writing data into
It is also called a optical reader.It scans or read text and
picturers on a paper and enter them directly into the
computer system.Laser technology is used in the
scanner.Once the picture or data is stored after scanning,
It can sent anywhere and can perform any operation on
Ajoystick is a pointing device that works on the
principle of trackball
On most joysticks, a button on the top is provided
to select the option currently pointed to by the
Commonly used for controlling player movements
in video or computer games.
11. Touch Screen
A touch screen is a touch sensitive display device.User
interact with by touching areas of the screen with the
finger.User give the command by touching the
screen.Many ATMs have touch screens.Computers or
notebook laptops also have touch screen display.
13. Output Devices
“An output device is a hardware compnent that produces
information for the user in the form of softcopy or
The output devices are following:
It is the most commonly used output device.It is like
television screen,which can be used to watch all the
activities we perform oncomputer.
Types of Monitor:
CRT (Cathode Ray Tube) Monitors
Flat Panel Monitor
15. CRT (Cathode RayTube)Monitor:
A CRT monitor is adesktop
monitor thar is similer to a standard television because it
contains a Cathode Ray Tube.A CRT is a large scaled glass
tube.The front of the tube is screen.Tiny dots of phosphor
meterial coat the screen on a CRT monitor.
Flat Panel Monitors:
They are muchthinner,weightless
and consume less power and space.Flat panel monitors are
manufactured by using several technologies but
LCD(Liquid Crystal Display)is coomon one.It produce
An audio output device is a component of a computer
that produces music or other sounds.Many users add
speakers to their computers to generate high quality
sound.When using speaker any one at nearby is listen
the output but when using headset,only the individual
wearing it can listen output.
Aprinter is a hardcopy output device that produces text
and graphics on the paper.Different printers have
different printing techniques.
There are two types of printers:
18. Impact Printer:
An impact printer work just like
typewriter.An impact printers creates characters on a paper
by striking pins or hammer against an inked ribbon.Impact
printer is noisy because of its striking activity.
Anon-impact printer forms
character and graphics on a paper without striking the
paper.Some spray ink,heat or pressure use to create a
output.It can also uses LASER technology.They are much
faster and quiter because they do not strike the paper.