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CCC New Syllabus, What is Computer

Based on NIELIT, BY Impulse Technology

What is Computer

The word computer comes from the word compute which means to calculate so a computer is normally considered as a computing device that can perform arithmetical operation at an a high speed. Computer had a great impact in our everyday life.

Type of Computer
  • Analog Computer
  • Digital Computer
  • Hybrid Computer


Analog Computer

Analog computer process information of physical nature, that uses the continuously changeable aspects of physical phenomena such as electrical, mechanical, or hydraulic quantities to model the problem being solved. Ex:- Temperature , Pressure , etc.

Digital Computer

Digital computer process information in the form of 0 and 1(bit) is known as binary number. In Computing term we mostly refer to digital type of computer. Digital computer fall in different ranges called Micro Computer , Mini Computer, Mainframe Computer, Super Computer Which can be further classified into ascending order of the their size – Small, Medium, Large, Very large.

Hybrid computers

Hybrid computers is a combination of digital computer and analog, both. The digital component normally serves as the controller and provides logical and numerical operations, while the analog component often serves as a solver of differential equations and other arithmetical complex equations. .

Analog Computer


Anatomy of Computer
    The major function unit of digital computer performed the following function
  • Inputing:- In the process of entering data into the help of input device.
  • Processing:- It refer to performed operation manipulation of data into the computer.
  • Outputing:- It refers to process of showing result in the form of hardcopy or softcopy.
  • Storing:- It refer to the storage of data and instructions to the computer memory.
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Components of Computer System

The internal arrangement of digital computer parts(Input Unit,Output Unit,Central Processing Unit, Memory Unit) is knows as Computer organization. This arrangement can be different from one computer to another computer system Digital computer performed following operation -Inputting, outputting, processing, storing, controlling all above operation is done by the CPU in Digital computer..

Center Processing Unit

It is the brain of computers system. In computer system all major operation (calculation, manipulation, comparison) are made by CPU. The CPU is responsible for activating & controlling the operation performed by all other unit of computer system. The Micro processor is the CPU of computer system .It is the unit of computer that interprets the instruction and executes them..

  • Arithmetic Logic Unit(ALU)
  • Control Unit(CU)
  • Memory Unit(MU)


Arithmetic Logic Unit(ALU)

All Calculation and comparison are made by the ALU. Arithmetic Unit design to performed Arithmetic Operation Add, Subtract, Multiply, Divide, and logical unit performed logical unit performed logical operation or comparison such as <,>, =..

Control Unit(CU)

How does the input device know that it is time to fit data into storage unit How does the All know what should be done with the data ones it is retrieve all these types of manupulation is done by Control unit (CU) CU obtain instruction From the program store in the memory ,interpreted instruction issue electrical signal that cause other unit of the system to be performed their function ..



Memory Unit(MU)

The function of the memory or primary memory is to store data an information that is currently running in computer. It is essential component of the computer system..

There are two types of Main memory..

  • Voloatile Memory(RAM/Cache)
  • NonVolatile(ROM/PROM/EPROM/EEPROM)