A keyboard is one of the most common input devices used with computers. It allows the user to key in programs and data and to control the computer system. The alphabetic and numeric keys are arranged in the same order as a typewriter. This layout is known as QWERTY because these are the first six letters on the top left of the keyboard.
Letters, numbers, symbols and blank spaces are known as characters. Computer keyboards have all the characters found on typewriters. In addition, they have some extra characters and some keys that do not produce characters but have special uses.
As with electric typewriters, most keys are auto-repeating. This means that, if they are held down, they repeat the same function again and again until they are released.
Unlike a typewriter, when using a computer keyboard, it is particularly important not to confuse the number 0 key with the letter o key and the number 1 with the letter ℓ.
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Sunday 5 October 2008
Requirements to become a chemist student
There are five requirements for a student who wishes to become a chemist. One is that he possesses greater than average aptitude for learning. Another is that he possesses a good working knowledge of mathematics. Still another is that he enjoys applying his knowledge. In addition, he should be curious about things – about what causes natural phenomena and about how a thing is put together, how it works, and why. Finally, he must be enthusiastic.
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