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10:49 AM, Tuesday, March 4, 2008

THREE types of hardware and their uses

1) Sound card


Enables the computer to output sound to audio devices, as well as accept input from a microphone. Most modern computers have sound cards built-in to the motherboard, though it is common for a user to install a separate sound card as an upgrade.


2) Keyboard

a device, to input text and characters by depressing buttons (referred to as keys), similar to a typewriter. The most common English-language key layout is the QWERTY layout. A majority of all keyboard keys produce letters, numbers or signs (characters) that are appropriate for the operator's language. Other keys can produce actions when pressed, and other actions are available by the simultaneous pressing of more than one action key.


3) Speakers

a device that converts analog audio signals into the equivalent air vibrations in order to make audible sound.