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1
UNIT 1
COMPUTER
OPERATIONS AND
FUNDAMENTALS
LESSON 2:
OUTPUT DEVICES
Lesson Contents
• What an output device is
• Examples of output devices
• Features of output devices
• Quick Test
• Recap
2
What is an output device?
3
An output device is any hardware that is
used by the computer to give us
information in a suitable form.
Different forms of output
4
Computer output
• Text/graphics displayed
on a screen (softcopy)
• Sound
• Printed text/graphics
on paper (hardcopy)
Examples of output devices
5
Monitor Printer Speakers
Headphones Projector
6
• There are many output devices.
• Each one has its own characteristics and
displays data in a different manner.
• Therefore the selection of an output device
depends on the type of output that will be
generated by the computer.
Features of output devices
7
Monitor
• Also called the Visual
Display Unit (VDU)
• Used to display text,
graphics and video
Types of monitor
8
Flat-panel monitor
(LCD / LED) CRT monitor
Features of output devices
9
Printer
• Used to transfer text and graphics from the
computer onto paper
Features of output devices
Dot-matrix printer
• Impact printer
• Low quality printouts
• Noisy and slow in operation
It forms characters on paper by
striking pins against an inked ribbon.
Dot-matrix printer
11
• It can produce carbon
copies of printouts using
special paper.
• It is used in banks, retail
outlets and offices to print
multipart stationery.
Features of output devices
12
Inkjet printer
• Non-impact printer
• Good quality printing
• Faster than the dot-matrix printer
• Quiet in operation
Inkjet printer
13
It forms characters/graphics by
spraying drops of liquid ink on paper.
Ink cartridges
It is used at home and in offices
where few printouts are needed.
Features of output devices
14
Laser printer
A non-impact printer that uses a laser beam
together with ink powder (toner) to transfer text
and graphics onto paper.
Toner cartridge
Laser printer
15
•High quality printing
•Works very quietly
•Very fast
•Used in offices where high volume of
printing is required.
Features of output devices
16
3D printer
A computer-aided manufacturing device that
creates three-dimensional objects.
3D printer
17
3D printing is done by building up the object layer
by layer. Plastic or other material may be used.
3D printer filaments
Features of output devices
18
Plotter
A device used to print large high quality
drawings using refillable pens.
Refillable pens
Plotter printing a large map
Plotter
19
It is used by designers, engineers, map-makers and
architects to produce giant posters, building plans
and maps.
Poster Building Plan Map
Features of output devices
20
Speakers
• Devices used to output
sound from a computer.
They are used during
multimedia presentations and for entertainment.
Features of output devices
21
Headphones
They allow a user to listen
to audio files privately.
Features of output devices
22
Video projector
A device that displays
enlarged images from a
computer onto a screen,
a wall or other surface.
screen
projector
Video projector
23
Uses:
• business meetings
• at school
• at home
• other places where a large screen
presentation would be beneficial.
Quick Test
24
TRUE FALSE
1. A video projector is used to show a
presentation on a large screen so that
everyone in the room can see it.
Quick Test
25
TRUE
A video projector is used to show a
presentation to a large audience.
1. A video projector is used to show a
presentation on a large screen so that
everyone in the room can see it.
Quick Test
26
TRUE FALSE
A plotter is used by architects to print
2. An architect uses an inkjet printer to
print very large building plans.
Quick Test
27
FALSE
A plotter is used by architects to print
large drawings.
2. An architect uses an inkjet printer to
print very large building plans.
Quick Test
28
TRUE FALSE
3. A laser printer can produce carbon
copies of printouts.
Quick Test
29
FALSE
Only dot-matrix printer can print carbon
copies of printouts.
3. A laser printer can produce carbon
copies of printouts.
Quick Test
30
TRUE FALSE
4. A laser printer is very slow and makes a
lot of noise.
Quick Test
31
The laser printer works very quietly and produces
high quality copies at a very high speed.
4. A laser printer is very slow and makes a
lot of noise.
FALSE
Recap
• An output device is a piece of hardware
used by the computer to give us information.
• Information can be
➢ heard
➢ displayed on a screen
➢ printed on paper
Recap
• Examples of output devices include
monitors, printers, speakers, headphones
and video projectors.
• The selection of a suitable output device
depends on the type of output generated by
the computer.
End of Lesson
34