Output Devices

IntroductionVarious Output Devices

MonitorsPrintersTypes of PrintersDot Matrix PrinterInkjet PrinterDaisy Wheel PrinterLaser PrinterPlottersSpeakers

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Introduction Any device that outputs information from a computer is called, an output

device.

Output devices enable the users to perceive the results of computer

processing.

An output device is any piece of computer hardware equipment used to communicate the results of data processing carried out by an information processing system (such as a computer) which converts the electronically generated information into human-readable form.

Devices that display, print, or transmit the results of processing from the computer’s memory.

An output device is any peripheral device that converts machine-readable information into people-readable form such as a monitor, printer, plotter and voice output device.

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Various Output Devices

MonitorsPrintersPlottersSpeakers

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The on-screen display enables the user to view the results of data processing.

The monitors has its own processing circuitry and memory, called Video RAM (VRAM).

The screen output is referred to as a soft copy, while the printed version of the same information is called the hard copy.

Monitors use Cathode Ray Tube (CRT) technology used in television sets.

Monitors

The image is formed by electrons “guns” which

shoots a stream of electrons at the screen’s

phosphorescent surface.

In a color monitor, three electron guns, (red,

green, and blue) are used.

They fire electrons in varying intensities to

produce on-screen shots.

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A printer is a device that prints output to a page. Printers are commonly categorized by the way

they create print characters Printers come in color or simply black and white. Most businesses have laser printers since the

quality is better. Printers can be connected to the computer or

networked using a print server.

Two basic print technologies are:- ∙Impact printers

∙Non-impact printers

Printers

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Impact Printer: An impact printer forms characters and graphics on a piece of paper by striking a mechanism contacts the paper.

Non-Impact Printers: A non-impact printer forms character and graphics on a piece of paper without actually striking the paper.

Types of Printers

Types of Impact PrinterDaisy Wheel PrinterDot-Matrix Printer

Types of Non-Impact PrinterInk-Jet PrinterLaser Printer

Types of Printer

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A dot matrix printer forms characters and graphics on the paper by producing pattern of dots.

Dot matrix printers are relatively cheap and so is the stationary they use.

Dot matrix printers are generally noisy. Slow, with speed usually ranging between 30 to

600 characters per second.

Dot Matrix Printer

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A Daisy Wheel printer is an impact printer that uses a wheel as a print head. As the Wheel rotates, a hammer strikes the backside of the spoke and presses it against the paper to print a character.

Can print letter quality characters. Printing speed is very slow.

Daisy Wheel Printer

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This is a non-impact printer that forms characters and graphics by spraying tiny drops of liquid ink onto a piece of paper.

Inkjet Printers are very quite to operate and can produce good quality printouts of both graphics and text.

Inkjet Printers are generally quite. Inkjet Printers can produce high quality color output

Inkjet Printer

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The mechanism of haw a laser printer works is similar to a photocopier. Laser printers are also known as page printers because they process and store the entire page before they actually print it.

Laser printers can be print text at speeds of 4 to over 30 pages per minute.

The cost per page of toner cartridges is lower than other printers.

Laser printers are quite and fast.

Laser Printer

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A plotter is large printer that generates high-quality documents by moving ink panes over the surface of paper.

Plotters are particularly useful to engineers and architects, as they produce high quality blueprints, maps, and floor plans.

Can print on large printers High quality printing Plotters are expensive

Plotters

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A speaker, or speaker system converts an electrical signal to sound

The term loudspeaker can refer to individual transducers (known as drivers), or to complete systems consisting of a enclosures incorporating one or more drivers and electrical filter components.

Loudspeakers are the most variable elements in an audio system and are responsible for the greatest degree of audible difference between sound system.

Speakers

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