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    Processing Device

                     The  device  that  works  on  the  input  is called

                     processing device.  CPU  is the main processing
                     device.

                     CPU stands for Central Processing Unit. It works
                     like the brain of a computer. CPU is fixed inside the
                                                                                            CPU       CPU Box /Cabinet
                     CPU box/cabinet.
                     Output Devices

                     The devices which help us to get the results are called output devices. Some of the
                     commonly used output devices are monitor, printer, headphones and speakers.

                                             Monitor                   Printer

                                            Headphones                 Speakers

                     The output displayed on a monitor is called a soft copy, while the output printed
                     on paper is called a hard copy.

                            Restart

                           The instructions that we give to the computer are called input.
                           The working of the computer is called processing and the result we get is
                           called output.
                           A computer works in three steps INPUT -> PROCESS -> OUTPUT. This is

                           also called IPO cycle.
                           A computer is made up of many parts. These parts are also known as IPO
                           devices.

                                                                                           How a Computer Works          29

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