Output devices allow data to be output from a computer and include monitors, printers, speakers, projectors, and control devices. Monitors include CRT, TFT, and 3D printers which use inkjet technology to produce 3D models. Printers consist of laser printers for high quality output, inkjet printers for low volumes, and dot matrix printers which are inexpensive. Projectors display computer outputs for presentations and control devices such as actuators, motors, buzzers, lights, and heaters convert electronic signals into motion or other outputs.

1. OUTPUT DEVICES
Output devices are hardware
devices that allow data to be
output from a computer.
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BY VIGNESH, ABUBAKAR AND KARE

2. CRT Monitors
• CRT monitors are the least expensive type of
monitor and they use an electron gun to fire against
a phosphor screen to create a picture.
• USES: They are used with light pens, for example
to allow designs to be created on screen.
• ADVANTAGE: The angle of viewing is still better
than with a TFT monitor.
• DISADVANTAGE: They run very hot and can cause
fire if left unattended.
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3. TFT MONITORS
• TFT monitors have screens made up of many tiny pixels
which are made up of transistors controlled by a
microprocessor.
• USES: They are an integral part of laptop computers.
• ADVANTAGES: They consume much less power and
don’t generate as much heat as a CRT monitor.
• DISADVANTAGES: The definition is sometimes not as
good as CRT monitors.
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4. LASER PRINTERS
• Laser printers produce a very high quality hard copy output. They
rely on large buffer memories where data for the whole
document is stored before the pages can be printed out.
• USES: They are the best option for fast high quality and high
volume printing.
• ADVANTAGES: They can handle very large jobs and the quality is
consistently high.
• DISADVANTAGES: They are fast only for several copies printed.
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5. INKJET PRINTERS
• Inkjet printers are used to produce good quality hard copies.
These printers don’t have to have large buffers, so printing is
done a bit by time.
• USES: Inkjet printers are used where low output volumes are
required.
• ADVANTAGES: They are very lightweight and have a small
footprint.
• DISADVANTAGES: Printing can smudge if not used carefully.
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6. 3D INKJET PRINTERS
• These are a new type of printer that produce solid 3D models
using modified inkjet technology. This technology is known as
‘tomography’, thin layers of fine powder are bounded
together as a 3D model.
• USES: Inkjets are used to produce prototypes which are
actually work from CAD packages, Photograph images, stored
drawings, etc.
• ADVANTAGES: The powders used can be often grouped and
reused.
• DISADVANTAGES: 3D inkjet printers are expensive to buy.
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7. DOT MATRIX PRINTERS
• Dot matrix printers are a type of impact printer, where a print
head presses against an inked ribbon. They tend to be noisy,
slow and the output is not of good quality.
• USES: They can be used in noisy environments and in
applications where print quality is not very important.
• ADVANTAGES: They are very cheap to run and maintain.
• DISADVANTAGES: They are very slow and the printing quality
is of poor quality.
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8. PLOTTERS
• Plotters are devices that produce hard copies, but operate in a
different way to printers. They produce highly accurate, very
large drawings and posters.
• USES: They are used to produce large pictures for use on
billboards or giant posters.
• ADVANTAGES: The print quality is extremely high.
• DISADVANTAGES: They are expensive both to buy and
maintain.
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9. SPEAKERS
• Speakers can be connected directly to a computer
or are built into the monitor or casing. Digital data
from the computer is converted into analogue form,
using a digital analogue converter (DAC).
• USES: They are used to play downloaded sound
files.
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10. MULTIMEDIA PROJECTORS
• Multimedia projectors receive signals that can be either
analogue or digital. The signal source is usually from the
computer, television or DVD player.
• USES: Multimedia projectors are used for training
presentations.
• ADVANTAGES: They enable many people to see a presentation
rather than all of them crowding round a small computer
screen.
• DISADVANTAGES: Images can sometimes be fuzzy
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11. CONTROL DEVICES
• Control devices are another type of output
device that are used to control processes in
conjunction with sensor devices.
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12. ACTUATORS
• Actuators are transducers and are
used to take signals from a
computer and convert them into
some form of motion, for example
operating motors, pumps, switches
and valves.
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13. MOTORS
• USES: Motors are used in many domestic appliances
such as cookers, water pumps and automatic
greenhouses to open windows.
• They are used to control robot arms in industry
• In computers, they operate fans, disk drives and DVD
drives.
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14. BUZZERS
• Buzzers are switched on or off by the actuator.
• USES: Buzzers are used in cookers and microwave ovens
to tell the operator when the cooking process is
complete.
• They are used in burglar alarm systems to warn if
intruders are present
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15. LIGHTS
• The actuator is connected to the switch that turns the
lights on or off.
• USES: They are used for security lights.
• Lights are used in greenhouses to control the lighting
conditions.
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16. HEATERS
• Actuators are connected to switches which turn the
heater on or off.
• USES: They are used in automatic washing machines,
cookers and central heating systems.
• They are used in automatic greenhouses to control the
temperature.
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17. THANK YOU.
CREDITS
Abubakar – Animator
Vignesh – Slide Designer
Kare – Editor
I.C.T Project
BY VIGNESH, ABUBAKAR AND KARE
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