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

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

“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 processor that makes comparisons, performance, calculation, reading, interpreting & controlling 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 the Primary memory is:-




RAM is classified into two categories:-

  • SRAM

  • DRAM

ROM is classified into four categories:

  • PROM

  • EPROM

  • EEPROM

  • UVPROM

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 a Logical decision.

The Function of ALU



  • Basic Arithmetic operation. Such as- add, subtract, product, division etc.

  • Logical operation. Such as- and, or, not, nor, and etc.

  • Memory operation. Such as- store, read etc.

  • Program sequence control operation. Such as- jump.

  • Sending the information to required path.
Definition of CPU, Parts and Functions of CU, ALU, Memory


Definition of CU


As the name implies the “Control Unit” is to control and monitor all the activities of a computer. It is controlled and communicated 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 the appropriate device for processing.

  • Presenting the processed data to appropriate device.

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