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01




               01                                                     A COMPUTER SYSTEM














                                  Your Aim

                                 to learn about:

                                         Hardware                         Software
                                          How Does a Computer Work?


            A computer is an electronic machine. It is made up of various devices like keyboard,
            mouse, monitor and CPU. These devices help you to 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 which 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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