in this slide we discus about input and output devices of computer which are used peripherally

1. Peripheral Devices
(Input and output)
SLIDE 08

2. Input hardware
 Hardware input is a type of hardware that functions to enter
data (input) into computer system memory. The main
hardware input of a computer system is the keyboard.
Mouse is a hardware input support (peripherals) of a
computer system. Here are some examples of input
hardware on a computer.

3. Keyboard
 The keyboard is the main input device of a computer
system consisting of buttons to operate a computer. The
keyboard can be used to input data thoroughly on a
computer system.

4. Mouse
 Mouse is a computer peripheral device that is used to input
data in the form of cursor movements, clicks, and scroll.
The mouse initially uses the ball to make cursor
movements, as technological developments use light
sensors to detect movement.

5. Scanner
 A scanner is an input hardware on a computer with input
data in the form of a scan of a document, like a copy
machine.

6. Joystick
 You can play video games using a joystick. It allows you to
move the objects quickly on the screen.

7. Light Pen
 Light pen is an input device, which has a special light
sensor for making selections on the screen. It is connected
 the monitor by a wire. The user brings the pen to the pred
point on the screen and presses it. A light pen is also used to
draw directly on the screen,

8. Optical Mark Reader (OMR)
 Optical Mark Reader (OMR) is an input device that can
scan and identify a specific type of mark made with a
special pencil or ink. OMR is used to check the objective
multiple-choice question (MCQ).

9. Microphone
 Microphone is an input device that converts human voice
into electrical signals which are passed on to the CPU.

10. Digital Camera
 Digital camera takes the photograph of an object and stores
it in the digital format. It has a memory chip to save each
digital image as a file which can then be transferred to the
computer.

11. Digital Camcorder
 Digital camcorder is an input device that is used for
recording audio and video in the digital format. After
transferring this video file to the computer, it can be viewed
using software.

12. Bar Code Reader
 Bar code is a coding technique, which uses vertical lines of
same height but varying width having gaps in between. You
may have seen these lines at the back of your textbooks.
Bar code reader is used to scan these bar codes.

13. MIDI Devices
 All Musical Instrument Digital Interface (MIDI) is a system
designed and manufacture for transmit information between
electronic musical instruments and the computer. A MIDI
musical keyboard can be attached to a computer without
any driver and it allow a performer to play music that is
captured by the computer system as a sequence of notes.

14. Output Devices
 To receive the result of work done by the computer, we
need output devices. An output given by the computer can
be in the form of a display on the screen or a printed
document or a songs Most of the output devices are
commonly used at home and offices, There are some
devices, which are not commonly used. Let's take a look at
the output devices.

15. MONITOR OR VDU VA
 Monitor is also called Visual Display Unit (VDU), The
Visual display of the processed data which the users can
view is displayed on the monitor. Computer monitors come
in a variety of sizes and resolutions.
 There are two types of monitors, namely CRT and flat
panel. All monitors need a video card, which is located on
the motherboard. It is the video card, which processes data
into images, and displays it on the monitor.

16. PRINTER
 Printer is another commonly used output device that is used
to print a document, picture, etc. on paper. The printed copy
is called hard copy. Printers are divided into two categories
based on their working.

17. SPEAKERS
 Speakers produce the audio output of recorded voice, music
and sounds. To produce audio output, a computer needs a
card called sound card, attached to the motherboard.

18. PLOTTERS
 Plotters are used to print high quality and large sized
graphs, tables and pictures. Unlike a printer, plotter can be
used to print on large sized papers.

19. PROJECTOR
 It is a hardware device, which displays computer data onto
a flat screen. The data is sent to the video card, which is
then translated into a video image and sent to the projector.
A projector is often used in meetings because it allows
output to be shown to a large audience.