A detailed note on Input and Output Devices

1. SUBMITTED BY: AMNA IMTIAZ
REGISTRATION NO: SP24 - BCT - 007
SUBMITTED TO: SIR MUHAMMAD HARIS
COURSE ID: CSC 101
TOPIC: INPUT AND OUTPUT DEVICES

2. COMPONENTSOF COMPUTER
INPUT PROCESSING OUTPUT

3. INPUT
DEVICES
 Keyboard
 Mouse
 Joystick
 Light Pens
 Track Ball
 Web Camera
“Those hardware devices which take data from user and send it to computer are
termed as hardware devices”
EXAMPLE
 Scanner
 Passport Scanner
 Pen Scanners
 Barcode Reader
 OMR
 Graphic Tablets

4. 1) KEYBOARD:
 Keyboard is an input device that is used to enter
the text.
 It includes various keys including letters,
numbers, specific characters as well as keys for
specific function.
 When a key is pressed on keyboard,
corresponding function is performed on the
computer.
 It may be connected to computer through wires
or wirelessly.
2) MOUSE:
 It is a pointing device that mainly controls the
cursor.
 Mainly, it has two buttons with a rotating wheel
button.
 By moving cursor through the mouse, we can
select our desired document, text or file.

5. 3) Joystick:
 Joystick is an input device primarily used to control digital
entities in games.
 You might have seen these in kids play zone.
 Typically, it consists of a lever like a gear that can be
rotated in any direction to control the movement of
particular object in gaming.
4) Light Pens:
 It is a light sensitive pointing device used with old CRT
monitors.
 It is basically used to select, modify or scan the text or
images on the screen.
 It may also be used to draw images, figures or to enter the
text.

6. 5) Trackball:
 Trackball is pointing device that is almost similar to
mouse used in computer gaming.
 Unlike mouse, you don’t need to move the entire
device.
 It has movable ball on its top so that you can manage
and control various moving objects in computer
gaming.
6) Scanner:
 Scanner converts physical documents like images,
graphics and texts into digital format
 In simple words, it is a digital photocopier which reads
handwritten or manual documents.
 Most commonly, it is used in offices to scan various
documents.

7. 7) Barcode Reader:
 Barcode reader is an input device that reads the barcode
pattern on the product, decodes the data contained on
the barcode and sends it to computer.
 Computer then shows the relative information of the
product
 It has become an essential tool in shopping malls to scan
the price and information of various products.
8) PenScanner:
 As the name shows it is a pen shaped input device.
 Pen scanners are designed to enter printed text from
books, magazines, articles and newspapers to computer
screen.
 On sliding the pen over the text, it will appear on the
computer screen within seconds.

8. 9) Graphic Tablet:
 Graphics tablet is an input device that aided the painters
and graphic designers in their profession.
 Graphics tablet allows user to draw images by hand on
the tablet with a special pen like stylus.
 The drawn image or written text then appears on
computer screen.
10) Passport Scanner:
 Passport scanners are designed for quick scanning of
passports, ID-cards, resident permits and driving
license.
 Most commonly, you see passport scanners on airports,
international hostel checks and security posts.

9. 11) OMR:
 OMR literally stands for optical mark recognition.
 It reads manual writing or specific marks on the paper
written by people.
 It reduced hourly processing of reading the documents.
 e.g. It reads the answers of multiple choice questions
and assign marks according to it.
12) Web Camera:
 This input device s assigned to record images, videos
and voice notes.
 These recorded pieces are then sent to computer for
further processing and its storage on the computer.
 They are now widespread in markets, offices and even
houses mainly for security purposes.

10. OUTPUT
DEVICES
“Those hardware devices that receive information from computer and sends to viewer
are called as output devices.”
They receive processed data from computer and transform into audio, video or text.
EXAMPLE:
• Monitor
• Printer
• Projector
• Headphones
• Speaker

11. 1) MONITOR:
 A display screen that provides visual output from computer
is termed as monitor.
 Old CRT monitors and LCD are its common examples.
 CRT stands for cathode ray tube while LCD stands for liquid
crystal display.
 Major difference between CRT and LCD is the technology of
their image formation.
 CRT monitors uses electro beam to display an image.
 While LCD produces an image on the screen by using liquid
crystal display.
 CRT monitors occupy more space and processing time as
compared to LCDs.
 With the advancement in technology, LEDs are now in more
practice as compared to LCDs
 LED stands for light emitting diode that use light emitting
diode in its functioning.
MONITOR
LCD
LED

12. 2) PRINTER:
 This is another familiar output device. Everyone would have
come across the printer.
 A printer is an output device that prints the paper documents
either from a computer or manually written paper.
 To print a document, the electronic data must be sent from the
computer to printer.
 Its mechanism is quite interesting.
 It has a laser which projects the image of your document on the
drum.
 Drum makes the page positively charged onto which print is to be
done.
 Drum then uses static electricity to attract the negatively charged
dry toner to the drum’s cylinder.
 The drum then rolls the toner onto the paper to create your
print.
 Heated rollers within printer are used to permanent the
impression of toner onto paper.
PRINTER
MECHANISM

13. 3) PLOTTER:
 Plotters are special types of printers that produce high quality
prints on large sheets.
 These are used to create decorated banners showing
advertisements, promotions or some news.
 In general, there are two types of plotters; pen plotters and
electrostatic plotters.
 Pen plotters uses pens in its mechanism that moves along x and
y-axes to create an image on the sheets
 Electrostatic plotters works like just a photocopier. It uses
charged toner particles to create an image on the paper. These
plotters produce high quality images and are mainly used for
architectural and engineering drawings.
 Plotters can produce highly efficient and increased quality
pictures with a proper manner and high accuracy which helps
engineers and architects in their professions.
Electrostatic Plotter
Pen Plotter

14. 4) PROJECTOR:
 You must be familiar of projector which are installed in
seminars, cinemas, conference halls and in classes.
 These video projector displays video, images, text or
presentations on a larger screen or other flat surface.
 These are commonly used in offices for business meetings, for
educational purposes in classed and for entertainment in
cinemas.
 Projector working involves splitting the beam of light primarily
into three colors; red, blue and green.
 The split light then passes through various filters.
 This filtered light is then fall on the prism and shown onto a
larger screen through lens.
 Projectors attract the attention of viewers within seconds
through its larger screen surface.
 Moreover, projector provides comfort to our eyes
Projector

15. 5) HEADPHONE:
 Headphones are output devices that consist of pair of small
speakers plug into a computer line or to speakers.
 Headphones are also known as earphones.
 They are used for listening sound from a computer, music
player or other such electronic device.
 They turn the electrical energy into sound by using magnets to
vibrate the air, which then creates sound.
 Digital audio is stored in the form of 0’s and 1’s;
 Headphones allows user listen to an audio note privately, in
contrast to loud speaker, which emits sound into open
atmosphere for everyone nearby to hear.
 Headphones are most commonly used in musical industries
and music production sites.
 They allow the user to listen a particular note ignoring the
surrounding noise.
Headphone

16. General
comparison
INPUT DEVICES
“Those hardware devices that send data
from user to the computer are termed
as input devices.”
EXAMPLE
• Mouse
• Keyboard
• Barcode reader
• Scanner
OUTPUT DEVICES
“Those hardware devices that send data
from computer to user are termed as
output devices.”
EXAMPLE
• Monitor
• Projector
• Headphone
• printer