Components of Computer System – Input output devices of computers | Computer awareness - Lesson 5

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Input Devices

Keyboard is among the most common and popular input device . It is used to input the data to the computer.
Mouse is a cursor-control device . It is a pointing and drop device.
Just like the mouse , Joystick is also a pointing device, which is used to move cursor position
on a monitor screen.
Light Pen
Light pen is also a pointing device. Its structure is similar to that of a pen.
Track Ball
Track ball are used mostly in notebook or laptop computer.
Scanner is an input device, which works on a similar principle of a photocopy machine.
Touch Screen
A touchscreen is an electronic visual display that the user can control through simple or
multi-touch gestures by touching the screen with a special stylus/pen and-or one or more fingers.
Digitizer is an input device which converts analog signal from the television camera into a
strings of binary digits that can be stored in a computer.
Magnetic Ink Card Reader (MICR)
As large number of cheques are processed everyday MICR serves a very useful purpose.

Optical Character Reader (OCR)
used to read a printed text and preparation of electricity bills, insurance premium, telephone bills.

OMR (Optical Mark Recognition)

process of capturing human-marked data from document forms such as surveys and test.

SCR (Smart Card Readers)

Smart cards containing an IC are sometimes called Integrated Circuit Cards (ICCs).

Bar Code Readers
used for reading bar coded data Bar Code and Reader scans a bar code image by converting it into an alphanumeric values


A microphone,is an acoustic-to-electric transducer or sensor that converts sound in air
into an electrical signal. Microphones are used in many applications such as telephones, hearing aids.

A webcam is a video camera that feeds or streams its image in real time to or through a computer
to computer network. When “captured” by the computer, the video stream may be saved, viewed or sent
on to other networks via systems such as the internet, and email as an attachment.

Output Devices

Monitor or the Visual Display Unit (VDU) is the main output device of a computer. It forms
images in the form of tiny dots, known as pixels.
 Cathode-Ray Tube (CRT)
 Flat-Panel Display
 3-D Monitors
Printer is among the most common output device, which is used to print information on paper.
1. Impact Printers
The printers that print the characters by striking against a ribbon and then onto
the paper, are called impact printers.
(i) Character printers
 Dot matrix printer
 Daisy Wheel
(ii) Line Printers
 Drum Printer
 Chain Printer

2. Non-impact Printers

(i) Laser Printers
(ii) Inkjet Printers


headphones are a hardware device that either plugs into your computer (line out) or your speakers


A hardware device connected to a computer’s sound card that outputs sounds generated by the
computer. It needs a sound card connected to a CPU, that generates sound via a card.


projector is an output device that can take images generated by a computer and reproduce
them on a large, flat (usually lightly colored) surface.

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