about computer

Computer:-

A computer is an electronic device which takes the input through input devices, processes  it and gives output through output devices.

Computer works with 0’s and 1’s (binary).

Like all electronic devices works with dc power supply. 

The term computer is derived from the Latin term ‘computare’, this means to calculate or programmable machine. 

Computer cannot do anything without a Program. It represents the decimal numbers through a string of binary digits.

The Word 'Computer' usually refers to the central processor Unit plus Internal memory.

Charles Babbage is called the "Grand Father" of the computer.

The First mechanical computer designed by Charles Babbage was called Analytical Engine.

It uses read-only memory in the form of punch cards..

Four Functions about computer are:

Input (Data):

Input is the raw information entered into a computer from the input devices. It is the collection of letters, numbers, images etc.

Process:

Process is the operation of data as per given instruction. It is totally internal process of the computer system.

Output:

Output is the processed data given by computer after data processing. Output is also called as Result. We can save these results in the storage devices for the future use.

Computer Classification: By Size and Power

Computers differ based on their data processing abilities. They are classified according to purpose, data handling and functionality.

According to functionality, computer's are classified as:

• Analog Computer: A computer that represents numbers by some continuously variable physical quantity, whose variations mimic the properties of some system being modeled.

• Personal computer: A personal computer is a computer small and low cost. The term "personal computer" is used to describe desktop computers (desktops).

• Workstation: A terminal or desktop computer in a network. In this context, workstation is just a generic term for a user's machine (client machine) in contrast to a "server" or "mainframe."

• Minicomputer: A minicomputer isn't very mini. At least, not in the way most of us think of mini. You know how big your personal computer is and its related family.

• Mainframe: It refers to the kind of large computer that runs an entire corporation.

• Supercomputer: It is the biggest, fastest, and most expensive computers on earth.
  
k computer

• Microcomputer: A microcomputer is a small,relatively expansive computer with a microprocessor as its CPU.it includes a micro processor,memory,and input/output facilities .