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Monitor

It is an output device. Monitor is also called VDU (Visual Display Unit).

It displays the result of work done by the computer.

Printer
Printer is an output device. It is used to get a printed copy of an

output. The printed output is also called a printout or a hard copy.

Speakers

Speakers are output devices. They are used for listening to music and
sound being played by the computer.

Processing Devices

The device that is used to process the input is called

the processing device. CPU (Central Processing
Unit) is the processing device of a computer. It is
called the brain of the computer. It is divided into The first hard drive introduced

the following parts: by IBM in 1956 was the size

1. Arithmetic and Logic Unit (ALU) of two refrigerators and could
only store 5 MB of data – less
2. Control Unit (CU) than a single song today!

3. Memory Unit (MU)

Arithmetic Logic Unit (ALU)

Input Devices Control Unit (CU) Output Devices

Memory Unit (MU)

Arithmetic Logic Unit (ALU)

This unit performs all the arithmetic operations such as multiplication, subtraction,
addition, and division. It also performs logical operations which involve comparisons.

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