How does a computer work?

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 A computer performs the following three operations in sequence.

  1. It provides data and instructions from the input device.
  2. Processes the data as per instructions.
  3. Provide the result (output) in a desired form. 
Computer Processing

A computer usually contain the following components:

Input Unit: It reads information from input devices such as keyboard ,or a scanner and sand it to the processing unit.

Input Unit


Output Unit: It display the processed information to the user through output devices such as a monitor or a printer or a speaker.

Output Unit


Central Processing Unit(CPU): It is the part of the computer that carries out the instructions of a computer program. It is the unit that reads and executes program instructions. The CPU consist of Storage or Memory unit, Arithmetic Logic Unit (ALU) and the Control Unit. 
CPU

Storage or Memory Unit: Also known as the primary storage or main memory, it store data, program instructions, internal results andb final output temporarily before it is sent to the output device.  

Memory Unit


Arithmetic Logic Unit(ALU): It is the unit where all arithmetic
operation (adition, subtraction etc.) and logical function (such as true or false, smaller than or greater than) are performed.  

Arithmetic Logic Unit(ALU)

Control Unit(CU): The control unit directs and coordinates most of the operations in the computer. It interprets each instruction issused by a program and then initiates the appropriate action to carry out the instruction. It also coordinates with all the input and output devices of a system.

Control Unit





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