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OUTPUT DEVICES
Output devices are hardware devices that allow data to be output
from a computer.
BY VIGNESH, ABUBAKAR AND KARE
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BY VIGNESH, ABUBAKAR AND KARE2
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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BY VIGNESH, ABUBAKAR AND KARE3
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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BY VIGNESH, ABUBAKAR AND KARE4
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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BY VIGNESH, ABUBAKAR AND KARE5
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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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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BY VIGNESH, ABUBAKAR AND KARE7
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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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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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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BY VIGNESH, ABUBAKAR AND KARE10
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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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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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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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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BY VIGNESH, ABUBAKAR AND KARE14
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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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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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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BY VIGNESH, ABUBAKAR AND KARE17
THANK YOU.CREDITS
Abubakar – AnimatorVignesh – Slide Designer
Kare – Editor
I.C.T Project