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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 as a supervisor and is used to control the flow of information from
the CPU to other parts of a 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
1. Which device is known as the brain of a computer?
uiz Bee ______________________________________________
2. What is the use of a keyboard?
______________________________________________
OUTPUT DEVICES
The devices that display the results of processing done by the CPU are called
output devices. Output can be a printout from the printer, sound from the
speakers, images on the monitor or content on the projector. The most commonly
used output devices are printer, monitor, speakers, projector, plotter, etc.
Hardware and Software 11

