FUNCTIONAL UNITS OF COMPUTER pdf Download – Hello friends Welcome to . Here We are providing functional unit of computer notes in pdf form.



Below are the functional units of computer.This Is A important part of Computer Syllabus for IBPS Po, Ibps Clerk . Every Year IBPS Ask Questions from This topic.

  • Arithmetic Logical Unit (ALU): ALU performs arithmetic and logic operations like Addition, subtraction, multiplication, division, logic and comparison. It is a part of the execution unit.
  • Control Unit (CU): Control unit controls the operations for all parts of the computer. It does not perform any data processing operations. It gives the command to transfer data from the input device into memory and from memory to ALU. It performs various functions:
    • Fetch-It gets an instruction from the main memory
    • Decode-Translates instructions into computer commands
    • Execute-It processes the commands
    • Store- It stores the result into the main memory


Functions of this unit are

  • Controls and transfers the data and instructions to the other parts of a computer.
  • It manages and coordinates all the units of the computer.
  • It obtains the instructions from the memory, interprets them and directs the operation of the computer.
  • It communicates with Input/output devices for transfer of data or results from storage.
  • It does not process or store data.
  • Central Processing Unit: CPU processes whatever input is entered into the computer. It is the part of the computer where the entire work is performed. It is also known as the brain of the computer. The ALU and the CU of a computer system are jointly known as the Central Processing Unit.

Machine cycle:

  • Fetch-In a machine cycle, instructions is fetched from the main memory.
  • Decode-The fetched instruction is translated into computer commands.
  • Execute-The command is actually processed.
  • Store-In this cycle, the result is written into the main memory.

Processor Speed- : Processor speed is measured in megahertz (Mhz) or in gigahertz. Processor speed is affected by system clock rate. The rate of an electronic pulse is used to synchronize processing.

Important Links

Important Links For Study Material And Test Series 

Follow Us On Facebook – Facebook Page 

The Hindu Daily News Paper Important Articles Pdf 

Join StudyDhaba.Com Telegram Channel –

Latest Current Affairs Magazine 2019 Pdf

UPSC Prelims ,Mains ,Optional Study Materials

UPSC Prelims Test Series 2020 Pdf 

UPSC Mains Test Series 2019-2020 

UPSC Optional Test Series 2019-2020 

SSC Study Materials 2019-2020 Pdf 

IBPS Study Material 2019-2020 Pdf

Insurance Exams Free Study Materials Pdf 2019

NEET Exam Free Study Material Pdf 

Latest RRB Study Material Pdf 

Teaching Exams Study Material Pdf 

EContact US  [email protected] / [email protected]
Note & Disclaimer – All Study Materials Here are shared Only For Educational Purposes .Most of The Material Is Already Available On Internet .We Are Just Sharing That Link Only  . Whole Materials Is For Education Purpose Only .We Work hard to Provide You Quality Study Materials And Error Free Study Materials For All Competitive Exams .You can Also Share Study Materials,Notes Or Any Materials With Us .We Will Publish That Material On Our Website .It is a Humble Request To All Of You Please Share This Post With Your Friends And On Social Media .