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Microphone
A microphone is an input device. It is used to record voice, music and sounds
that can be stored in a computer.
Web Camera
A web camera is used to take pictures in digital form and store
photographs in the computer. It is also known as webcam.
Light Pen
A light pen is used to point to objects or draw on the screen in a way
like a touchscreen.
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 CPU
the data and instructions from the memory unit and passes them Arithmetic Logic Unit
to the 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 Memory Unit
results of the processing.
Output Devices
The result we get after processing is called Output. The devices which help us to get these
results or outputs are called output devices. Let us study about some of the commonly
used output devices.
Computer System 9

