S.N.R.F. Around the Cyber Galaxy
Guess What We Are Learning About Today!!!??????????????? Output Devices
An output device is a hardware used to get information out of a computer.
The First Output Device is: The MONITOR!
A monitor is the screen on which words, numbers, and graphics can be seen. It is the most common output device.
There are two types of Monitors. They are : 1- CRT which stands for (Cathode Ray Tube) Monitors 2- TFT which stands for (Thin Film Transistor)
CRT ( Cathode Ray Tube ) Monitors: • Large and bulky and have a glass screen which makes them fairly robust and difficult to damage . • Produce quite a lot of heat so when you have an office with lots of them it could get quite warm. • Fairly noisy compared to newer TFT monitors. • Used most commonly in the manufacturing of television screens.
TFT(Thin Film Transistor) Monitors: .Thin and occupy less space. .more easy on the eyes of the viewer in front of it. .not good while viewing it from different angle. .Quieter than CRT monitors and also create less heat. .But the bad thing about it that it can be damaged easily by anything example your nail or a pencil.
The Second Output Device is: The PRINTER!!
Printers are used to create a “hard” copy of your work that you can hold, and hand to someone. Most printers print their work on paper although it is not the only thing that you can print on. You can also print on clothes, utensils, calendars, and many other things.
There are four types of printers: Laser Printers Ink-jet printers Dot-matrix Plotters
Laser Printers • Uses a beam of light for printing operations. • Print in the same way as photocopiers. • Uses a powdered ink, called ‘Toner’. • Fast, quiet, and have a high quality. • Bulky and expensive to buy or repair. • Best used in offices.
Ink-jet Printers • Use cartridges which contain ink. • Prints by heating the ink as it flows through the nozzle making a small dot. • Best used at home. • More popular ‘cause it’s cheaper and compact less than Laser printers. • It is noisier and can print really slow compared to Laser printers. • It has a better quality and faster than Dot-matrix printers.
Dot-matrix Printers • Has a pin grid on the print head. • First type of printers to be used in homes and schools but not used much nowadays. • Works by pushing a pin and then the print head hit a carbon ribbon leaving an imprint on the paper. • Ideal when you need carbon copies. • Robust, cheap, and can print on continuous stationary. • Has poor quality, is very slow and noisy, and can’t produce colour copies.
Plotters • Special type of printers that print high quality images on large pieces of paper. • Used by engineers, architects and map-makers to draw plans of buildings, diagrams of machines or large scale maps. • Print using a pen that can be lowered or raised by controlled motors. • Draws as if an expert draws them. • Slower than other printers. • More expensive and produce poor quality text print outs.
The Third Output Device is: The HEADPHONES!!
Using speakers can disturb the people in the area. • If there is a lot of music in the background, the speakers may misrepresent it. • That’s why headphones are used instead. • Can be used to listen to music using: • MP3 player • IPod • Computer /laptop • Any music system
The Fourth is: The LIGHT!!!!
Lights such as LEDs (Light Emitting Diodes) can be connected to a computer and respond to electrical signals which tell them to switch on and off. • Control devices are used when the computer is controlling a situation such as traffic lights. • Can provide a warning for users with hearing loss who might not be able to hear the error beeps. • Come in a large range of different colors. • The bulb may break or wear out and need replacing • There may be a loose connection which makes them unable to switch on.
The Fifth One is: The PROJECTOR!!!
Takes the display from the computer screen and show it in a larger size on a flat surface. • Used in meetings and presentations. • Used to show information for a lot of people. • Small, rarely bigger than a toaster, weighs a few pounds, and needs small space. • Quality of image may not be as good as the original and requires a dark room.
The Sixth One Is: The SPEAKERS!!!!
Important part of a home computer system. Absolutely essential for web conferencing and internet phone service. Allows users to have a greater experience with computers. Useful for watching videos on DVD and more. Speakers in Manufacturers computers include a set of standalone speakers that can handle a wider range of sounds. Make a wide variety of high-quality speaker systems. Stand alone speakers that come with computers are usually enough for most gaming and movie watching.
References http://www.tech-faq.com/types-of-computer-monitors.html http://www.wacona.com/output/output.html http://www.teach-ict.com/gcse/hardware/output/miniweb/printers.htm http://www.tech-faq.com/how-a-laser-printer-works.html http://teach-ict.com/gcse/hardware/output/miniweb/laser.htm http://teach-ict.com/gcse/hardware/output/miniweb/monitors.htm http://teach-ict.com/gcse/hardware/output/miniweb/inkjet.htm http://teach-ict.com/gcse/hardware/output/miniweb/dotmatrix.htm http://teach-ict.com/gcse/hardware/output/miniweb/plotter.htm http://www.allaboutheadphones.com/ http://teach-ict.com/gcse/hardware/output/miniweb/lights.htm http://www.computerhope.com/jargon/p/projecto.htm http://wiki.answers.com/Q/Advantages_and_disadvantages_of_a_projector http://www.hdtvsolutions.com/big_picture_projectors.htm http://www.compu-mart.com/computerspeakers.html