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01                                A COMPUTER



                                                                                                   SYSTEM











                                      Your Aim

                                      to learn about:

                                          l  Hardware                       l  Software
                                            l  How Does a Computer Work?


                 A computer is an electronic machine. It is made up of various devices like keyboard,
                 mouse, monitor and CPU. You can enter the data (input) through keyboard or

                 mouse, process the data using CPU and display the results (output) on the monitor
                 or printer.

                     HARDWARE

                 All the physical components of a computer system are called hardware. These are
                 the parts that we can see or touch. Hardware devices are further classified as shown:



                                                            Hardware






                           Input                Processing                 Output                 Storage
                          devices                  device                 devices                  devices

                 Input Devices

                 A computer accepts data and instructions through input devices. Some of the
                 input devices are keyboard, mouse, scanner, joystick, microphone, etc.
                 Keyboard


                 A  keyboard is used to enter  words,  numbers and
                 special characters.
                                       Mouse


                                       A mouse is a pointing device that inputs data by pointing, clicking
                                       and dragging.



                                                                                             A Computer System     7
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