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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
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