output & input devices discription in detail.

3.  An input device feeds data to the computer
system for processing.
 Here is a list of input devices of a Computer
System. We are going to discuss the most
commonly used input devices in this article.

4.  Keyboard
 Mouse/POINTING DEVICES
 Scanner
 Digital Camera , Camcorder
 Gamepad, Joystick, Steering wheel.
 Mic
 Barcode Reader
 Pen / Stylus
 Touch Screen
 Webcam
 Biometrics (Thumb impression / Face detection)

5.  Keyboard is the most common input device
of a Computer System. The keyboard
resembles a typewriter. Modern Keyboards
have more than just the letter and numeric
keys. They have multimedia keys for volume
control, Play / Pause videos etc. Every single
key on a keyboard is assigned a binary
numbers to it which transmits that binary
pattern to the computer.

6.  MOUSE
 TOUCHPAD
 TRACKPOINT
 TRACKBALL
 JOYSTICS
 TOUCHSCREEN
 GRAPHICS TABLETS
 SCANNER
 MICOPHONE
 MIDI DEVICES

7.  Mouse is another commonly used input
device of a computer system. The mouse is a
pointing device that moves the cursor on the
screen. You can place the cursor on icons and
by clicking you can launch a program. A
typical Mouse has two buttons, the left and
right clicking buttons and a wheel in the
center for scrollingA user can perform many
operations through a Mouse, like selecting or
arranging different program icons on the
desktop

9.  Scanner is the third
important input device of
a computer system. A scanner converts
printed documents in to images. Some types
of scanners scan documents and produce the
results in black & white images. The scanner
operates in the same manner as a
Photocopier. A colored scanner works
somewhat in a complicated manner as
compared to a simple scanner.

10.  Digital Cameras are used to capture images.
Those images are then transferred to a
computer when the Camera is connected to
the computer. Mostly the Digital Camera
images are in JPEG format.

12.  Output devices displays the processed form
of data to the end user.

13. Common Output devices include;
 Monitor
 Printer
 Speaker(SOUND OUTPUT)

14.  Monitor is the most important output device
of a computer system. The monitor is the
display screen of a computer. Cathode Rays
Tube (CRT) and Liquid Crystal Display (LCD)
are the two types of Monitors.

15.  CRT MONITORS (CATHODE RAY TUBE)
 FLATPANNEL MONITORS
1) LIQUID CRYSTAL DISPLAY
2) GAS PALSMA DISPLAY
 TOCH SCREEN MONITORS
1) Resistive Touch Screen
2) Surface Wave Touch Screens
3) Capacitive Touch Screen

16.  A Printer takes print commands from a computer
and print out text / images on a paper. Different
types of printers are available for various
purposes. A printer for office use must be heavy
duty and fast while for photographs it must
produce high quality prints. Dot-Matrix, Ink-Jet,
Laser-Jet are the different types of printers.
Print quality of Laser-Jet printer is excellent as
compared to Ink-Jet or other types of printers,
but they are relatively more expensive than the
others. Most laser printers produce black &
whiter prints while some can produce color
prints as well. The color laser printers are way
too expensive then black & white laser printers.

17.  1.Impact printers
 1.1. Dot-Matrix Printers
 1.2.Daisy-wheel printers
 1.3.Line printers
 1.4.Drum printer
 1.5.Chain printers
 1.6.Band printers
 2.Non-impact printers
 2.1.Ink-jet printers
 2.2.Laser printers
 2.2.1.Advantages of Laser Printer
 2.2.2. Disadvantages of Laser Printer

18.  Speaker is an important part of a computer
system. Some systems have a built-in
speaker, though they are small in size.
Speaker is an essential part of a computer
because they can notify about various system
notifications through various sounds. Big
speakers, woofers & sub-woofers are used for
enhance sound quality or creating a mini
home theater.

19.  An input device sends information to a
computer system for processing, and
an output device reproduces or displays the
results of that processing. Depending on the
interaction, a device can be both, referred
to as an input/output or I/O device.