What are the basic units of computer? Give names of three sub-units of CPU and also give the functions of each unit.



The basic units of computer are:

  • Input unit
  • Output unit
  • CPU
  • Memory unit

The 3 sub units of CPU and their functions are:

  • Control Unit - controls sequential instruction execution, interprets instructions and guides data flow through the computer’s memory, ALU and input or output devices.
  • Arithmetic Logic Unit (ALU) - performs all the arithmetic and logic operations that need to be done as per the instruction in a program.
  • Registers - CPU uses registers to temporarily hold processing information when the  processing is going on.
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Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 14 years. He provides courses for Maths, Science, Social Science, Physics, Chemistry, Computer Science at Teachoo.