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01                       THE COMPUTER—



                                                                                         AN OVERVIEW













                                       Your Aim


                                       to learn about:
                                          l  Working of a Computer       l  Input Devices
                                            l  Processing Device          l  Output Devices



                 As you know, a computer system is made up of two parts—Hardware and Software.

                    The parts of a computer that we can see and touch are called Hardware.
                     A computer needs instructions to do anything. These step-wise instructions are

                    called software.
                     WORKING OF A COMPUTER


                 A computer works on the IPO (Input-Process-Output) cycle. It receives input from
                 the user through input devices, processes the input using the CPU and gives back
                 the output using output devices. This process is known as IPO cycle.














                         Input devices                   Processing device                  Output devices

                                                              IPO Cycle

                     INPUT DEVICES

                 A computer accepts data and instructions from you through the input devices. Data
                 can be in the form of numbers, text, sounds or graphics.








                                                                                      The Computer—An Overview     7
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