Computer
Computer technology" and "Computer system" redirect here. For the company, see Computer Technology Limited. For other uses, see Computer (disambiguation) and Computer system (disambiguation)
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A computer is a general purpose device that can be programmed to carry out a set of arithmetic or
logical operations. Since a
sequence of operations can be readily changed, the computer can solve
more than
one kind of problem.
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The first electronic digital computers were developed between 1940 and 1945. Originally they were the size of a large room, consuming as much power as several hundred modern personal computers (PCs).[1] In this era mechanical analog computers were used for military applications.
Modern computers based on integrated circuits are millions to billions of times more capable than the early machines, and occupy a fraction of the space.[2] Simple computers are small enough to fit into mobile devices, and mobile computers can be powered by small batteries. Personal computers in their various forms are icons of the Information Age and are what most people think of as “computers.” However, the embedded computers found in many devices from MP3 players to fighter aircraft and from toys to industrial robots are the most numerous.
Contents
History of computing
The first use of the word “computer” was recorded in 1613 in a book
called “The yong mans gleanings” by English writer Richard Braithwait I
haue read the truest computer of Times, and the best Arithmetician that
euer breathed, and he reduceth thy dayes into a short number. It
referred to a person who carried out calculations, or computations, and
the word continued with the same meaning until the middle of the 20th
century. From the end of the 19th century the word began to take on its
more familiar meaning, a machine that carries out computations.
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