A computer is a
general purpose device that can be programmed to carry out a set of
arithmetic or logical operation. Since a sequence of operations. can
solve more than one kind of problem.
Conventionally, a
computer consists of at least one processing element, typically a
central processing unit (CPU) and some form of memory. The processing
element carries out arithmetic and logic operations, and a sequencing
and control unit that can change order of operations based on stored
information's.
Peripheral devices allow information to be retrieved from an external source, and the reslut of operations save and retrieved.
In World war II,
mechanical analog computers were used for specialized military
applications. During this time the first electronic digital computers
were developed. Originally they were the size of a large room, consuming
as much power as several hundred modern personal computers (pc).
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.
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
"Computes."
However, the embedded computers found in many devices from MP3 players
to fighter aircraft and from toys to industrial robots are the most
numerous.
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