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Processing Device
The CPU (Central Processing Unit) is the processing device that works on input and sends the
result to the output devices. The CPU is a chip which is placed inside the CPU box.
CPU is also called the brain of a computer as it is responsible for all the work done. A CPU is
further divided into three parts: ALU, CU and MU.
Arithmetic Logic Unit (ALU)
ALU does all the arithmetic calculations like addition, subtraction,
multiplication, division, etc. It also does comparisons like greater
than, less than, equal to, etc.
CPU CPU box
Control Unit (CU)
CU coordinates and controls all the parts of the CPU. The CU gets the CPU
data and instructions from the memory unit and passes them to the Memory Unit
ALU in a step by step manner.
Memory Unit (MU) Control Unit
The CPU also has a memory like human beings. It stores the data and
instructions that you give to the computer along with the results of Arithmetic Logic Unit
the processing.
Output Devices
The result we get after processing is called output. The devices which help us get these results
or outputs are called output devices.
Some output devices you have already learnt in the previous class
are monitor and printer.
Now let us learn about more output devices.
Speakers
Speakers are used to listen to music, voice and sound on a computer.
Headphones
A headphone is used to listen to music and sound without disturbing others as
they are worn by an individual. But wearing them for a long time can affect your
hearing power and cause damage to your ears.
Plotter
A plotter is used to print big sketches, diagrams and maps on long sheets
of paper. They are used by engineers, architects, scientists and designers.
Computer Hardware and Software 13

