input and output devices

2. Input and Output devices
An input and output devices are working as a INTERFACE between USER and
COMPUTER.
Interface
Computer User
Output Devices
Input Devices
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4. Input Device Output device
Keyboard Monitor
Mouse Printer
Scanner Plotter
Microphone Projector
Webcam Speakers
Joysticks
Barcode Reader
Touch Pads
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6. It allows data entry into a computer system by pressing a set of keys . It is
an also called 101 QWERTY keyboard
Standard Keyboard has 101 Keys.
It contains :-
1. Function keys : f1-f12.
2. Alphanumeric keys : a-z,0-9.
3. Special character : ‘ , ’’ , ( , ) , { , } , [ , ] , @ , $ , ^ , & , * , _ , + , - , _ , = , !
,~,`,<,>,?,.,|,/,,
4. Control keys : shift, ctrl, alt
5. Special purpose keys : space, backspace, home, page up, page down, end,
print screen, num lock, caps lock.
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7. Function Keys Special Purpose Keys
Control Keys
Alphabetic keys Arrow Keys Numeric keys
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8. Second most important input device
is mouse which is a pointing device
connected to CPU used in GUI
environment to pointing any objects
presenting in console.
Its available in two type:-
1. Wired Mouse
2. Wireless Mouse Normal Laser Wired
Mouse
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9. In this type of Mouse has no wires it
is directly connected with CPU
using wireless connections i.e.
Bluetooth.
Wireless Laser Mouse
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10. A scanner is an input device that translates
paper documents into an electronic formats
that can be stored in computer. The input
document may be typed text , pictures,
graphics, or even handwritten material.
Scanne
r
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11. Barcode reader is used to read barcode
which is present on any product , books
or any product. These code are in form
of block and thin bars which gives the
information about the product.
Barcode Reader Generally used in
Shops, library and post offices etc.
Button
Reader
Barcode Reader 11

12. A touch pad is pointing device
featuring a Tactile Sensor, a
specialized surface that can translate
the motion and position of a user’s
fingers to a relative position on
screen.
Generally it founds in Laptops,
PDA’s & Portable media player. It
is also used as substitute for a
mouse.
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13. A Microphone is hardware input
device that takes sound as a input
to computer. It convert the sound
into an electrical signal to send to
the computer for communicating
any other terminal or to record the
sound. Generally it connected with
3.5 mm jack plug.
Microphone 13

14. A webcam is a video camera feeds its
images in real time to a computer or
computer networks often via USB of
Wi-Fi. The most popular use is the
establishment of video links for
meeting or chatting or others work.
Webcam
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15. An input device that looks similar to a
control device you would find on an
arcade game at your local arcades.
A Joystick allows an individual to easily
move an objects in a game such as
navigating a plane in any games.
Buttons Handle
Joystick
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17. Monitor is a most important part of the
computer and is to be used to producing an
soft copy of output. They display the
generated output on a television screen.
Two basic types of monitors used today
are:-
1. CRT(Cathode-Ray-Tube) :- It works
much like a television screen and are CRT Monitor
used with non-portable computer
system.
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18. 2. LCD(Liquid Crystal Display) :- LCD
flat panel monitors are thinner, lighter
and are used commonly with portable
computer system like notebook
computer(Laptops). Now a days
maximum users using the LCD Monitors
in place of CRT Monitors.
LCD Monitors
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19. Printed Page
Printers are the most popular output devices for
producing hard-copy output. Its a peripheral which
prints a text or graphics of documents stored in
electronic form in the memory of CPU.
Generally Printers are divided into two category:
1. Impact printer
2. Non-Impact Printer
But for the Best result of output user generally
Laser Printer
uses the laser or inkjet printer. It gives the High
Quality good color printing in documents.
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20. Its is a type of printer which is used to
print or produce hard copy of document.
Many engineering deigns application
like architectural plan for building,
design of mechanical components of an
aircraft or a car etc. So the above
requirement are completed by plotter
because these designs are printed in
large size of paper. Normal printer can’t
complete this requirements.
Plotter
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21. Operation
Projection Lens
buttons
A projector is an output device that
receives a video signal and projects the
corresponding image on a projection
screen using a lens system. All video
projectors use a very bright light to project
the image, and most modern ones can
correct any curves, blurriness, and other
inconsistencies through manual settings.
Video projectors are widely used for many
applications such as, conference room Projector
presentations, classroom training, home
theatre and concerts.
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22. Speaker are also an part of computer. It
converts the sound from electronic form
of sound signal which are stored in
CPU.
In multimedia application software it is
very important element of computer.
Some time at the time of creating
presentation it should be necessary that
to insert the sound file in presentation to
make presentation effective,
understandable and meaningful. A pair of Speaker set with
Generally it is used for listening music woofer system
and watching videos. 22

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