Page 15 - TP_Plus_v4_Class3
P. 15
Processing Device
The CPU (Central Processing Unit) is the hardware processing device that works on input data
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.
Control Unit (CU) CPU CPU box
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 Control Unit
ALU in a step by step manner.
Memory Unit (MU) Arithmetic Logic Unit
The CPU also has a memory like human beings. The MU stores the
data and instructions that you give to the computer along with the Memory Unit
results of the processing. Memory Unit is known by different names
like Internal storage unit, main memory, primary storage or RAM.
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 over the ears 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

