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Output Devices


Monitor

The monitor shows information on the screen when you type. This is called outputting information. 

When the computer needs more information it will display a message on the screen, usually through a dialog box

Monitors come in many types and sizes. The resolution of the monitor determines the sharpness of the screen. The resolution can be adjusted to control the screen's display.

Most desktop computers use a monitor with a cathode tube or liquid crystal display. Most notebooks use a liquid crystal display monitor.

To get the full benefit of today's software with full colour graphics and animation, computers need a color monitor with a display or graphics card.

Printer

The printer takes the information on your screen and transfers it to paper or a hard copy. There are many different types of printers with various levels of quality. 

The three basic types of printer are; dot matrix, inkjet, and laser.

Dot matrix printers work like a typewriter transferring ink from a ribbon to paper with a series or 'matrix' of tiny pins. 

Ink jet printers work like dot matrix printers but fires a stream of ink from a cartridge directly onto the paper. 

Laser printers use the same technology as a photocopier using heat to transfer toner onto paper.


Video Projector

A video projector is an image projector that receives a video signal and projects the corresponding image on a projection screen using a lens system. 

All video projectors use a very bright light to project the image, and most modern ones can correct any curves, blurriness, and other inconsistencies through manual settings. 

Video projectors are widely used for many applications such as, conference room presentations, classroom training, home theater and concerts. 

Projectors are widely used in many schools and other educational settings, sometimes connected to an interactive whiteboard to interactively teach pupils.

A video projector, also known as a digital projector, may project onto a traditional reflective projection screen, or it may be built into a cabinet with a translucent rear-projection screen to form a single unified display device.


Sound Card

A sound card is an expansion card or integrated circuit that provides a computer with the ability to produce sounds that can be heard by the user either over speakers or headphones.

Uses of a computer sound card
  • Games
  • Audio CDs and listening to music
  • Watch movies
  • Audio conferencing
  • Educational software
  • Business presentations
  • Record dictations
  • Voice recognition
The computer sound card is considered a peripheral, although the computer does not need to have one the majority of today's computers will have a sound card in the expansion slot or a on the motherboard (onboard).


Computer speakers

Computer speakers, or multimedia speakers, are speakers external to a computer, that disable the lower fidelity built-in speaker. They often have a low-power internal amplifier. 

The standard audio connection is a 3.5 mm (approximately 1/8 inch) stereo jack plug often color-coded lime green (following the PC 99 standard) for computer sound cards. 

A plug and socket for a two-wire (signal and ground) coaxial cable is widely used to connect analog audio and video components. Rows of RCA sockets are found on the backs of stereo amplifier and numerous A/V products. The prong is 1/8" thick by 5/16" long. A few use an RCA connector for input. There are also USB speakers which are powered from the 5 volts at 500 milliamps provided by the USB port, allowing about 2.5 watts of output power.

Computer speakers range widely in quality and in price. The computer speakers typically packaged with computer systems are small, plastic, and have mediocre sound quality. Some computer speakers have equalization features such as bass and treble controls.


Video Adapter


Alternatively referred to as a graphics card, video card, video board, or a video controller, a video adapter is an internal circuit board that allows a display device such as a monitor to display images from the computer. 

Today's video cards are most commonly connected to the AGP, PCI, or PCIe expansion slot on the motherboard, however, can also be found on-board. 


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