Definition of CPU, Parts and Functions of CU, ALU, Memory

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“Central processing Unit” is the full form of CPU. The brain & heart of any computer is CPU. It is a processor often called microprocessor. It is the central processer that makes comparisons, perform, calculates, reads, interprets & control the execution of the instruction.

The Different Part of CPU

The main parts of CPU are there-

Memory can be divided into four parts-

  • Primary Memory
  • Secondary Memory
  • Cache Memory
  • Flash Memory

The part of Primary memory are:-

RAM is classified into two categories:-

  • SRAM
  • DRAM

ROM is classified into four categories:

  • PROM

The parts of secondary Memory are:-

  • Hard Disk
  • Floppy Disk
  • Compact Disk
  • Digital Versatile Disk
  • Blue Ray Disk
  • Pen Drive


Definition of ALU

The full form of ALU is Arithmetic Logic Unit. This unit process every accepted data by using two methods, one is – Making Mathematical calculation & another is Making Logical decision.

The Function of ALU

  • Basic Arithmetic operation. Such as- add, subtract, product, division etc.
  • Logical operation. Such as- and, or, not, nor, nand etc.
  • Memory operation. Such as- store, read etc.
  • Program sequence control operation. Such as- jump.
  • Sending the information to required path.


Definition of CU

As the name implies the “Control Unit” is to control and monitor all the activities of a computer. It is control and communication with ALU, Memory Unit and Input Output Unit.


The Function of CU

  • Obtaining information from one or more sources. Like- keyboard, mouse, scanner etc.
  • Presenting the data and instruction to appropriate device for processing.
  • Presenting the processed data to appropriate device.


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One Response

  1. Otis Turturo

    Pretty nice post, thanks for the awesome article. I’m having troubles subscribing to your blogs feed. Thought I’d let you know