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Microphone: A microphone is an input device used to record voice,
music and other sounds on a computer.

Microphone

Scanner: A scanner is an input device that reads text or images
and sends their copies to the computer.
Scanner

PROCESSING DEVICE

The device which is used to process the input data is called a processing device. In

a computer system, the Central Processing Unit (CPU) works as a processing
device. It controls the entire working of the computer system.

The parts of the CPU are:

Arithmetic Logic Unit (ALU): It performs all the arithmetic

operations such as addition, subtraction, multiplication,
division and all the logical operations such as greater

than, less than, equal to, etc. CPU Box CPU

Control Unit (CU): It controls the working of all the parts of a computer.
It acts like a supervisor and is used to control the flow of information from

the CPU to other parts of the computer and vice-versa. The CU gets data
and instructions from the memory unit and passes them on to the ALU in a

step-by-step manner.

Memory Unit (MU): It stores the instructions given by the input devices before
they are sent for processing. It also stores the result or the output before it is

sent to the user.

Central Processing Unit

Arithmetic Logic Unit
Input Devices Control Unit Output Devices

Memory Unit

Operating a Computer 27