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4. The CU sends the data to the ALU, which performs the subtraction and

produces the result 30. This is process.
5. The CU stores the result in the Memory unit.
6. The CU takes the result from the Memory unit and displays it on the monitor.

This is output.

Control Unit 50, 20, - Control Unit 50 - 20 = 30
Memory Unit ALU

30 Control Unit 30 Control Unit
Memory Unit

Try This Logical Thinking

Unscramble the letters to form words related to working of a computer.
1. CORSSPE ____________________
2. RYMOME TINU ____________________

3. ABODRTHMORE ____________________
4. UOPUTT ____________________

Database Subject Enrichment

Intel, with the help of Ted Hoff, produced the world’s first microprocessor or CPU, the
Intel 4004, on November 15, 1971.

Post-Processing   


 A computer follows certain steps to perform a task.

 A computer works on the principle of IPO (Input-Process-Output) cycle.

 Data and instructions given to a computer is called Input.

 The action performed by the computer on input is called Process.

 The result produced by the computer after processing data is called Output.
 The CPU is made of Control Unit, ALU, and Memory Unit.

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