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21 st
                                                              Century   #Initiative
                                                                Skills
                                          “We should not switch off the main
                                          power supply button without safely
                                          shutting down the computer. It may
                                          cause harm to the computer.”






                           HOW A COMPUTER WORKS?

                 You know that a computer cannot function on its own. It needs instructions to

                 work. Let us observe how the IPO cycle works in daily life.

                 WASHING CLOTHES IN A WASHING MACHINE

                 In  this example, dirty clothes and washing powder are the inputs. We are

                 washing the clothes as a set of processes. So, washing clothes is the process.
                 We get clean clothes as the output.

















                                                                 Process
                    dirty clothes and washing powder            washing the clothes              clean clothes
                                 (Input)                             (Process)                      (Output)


                 CALCULATING NUMBERS


                 If we are asked to add the numbers 10 and 5.


                                                 10           5          +      =    ?



                 To add these numbers, we will use our brain to think and calculate.


                                10,5,+                          10 + 5                             15
                                 Input                         Process                          Output







                                                                                             Operating a Computer  23
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