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    The CU gets data and instructions from the memory unit and passes them on
                         to the ALU in a step-by-step manner.

                       Memory Unit (MU): It stores the instructions given by the input devices before
                         they are sent for processing. It also stores the result or the output before it is
                         sent to the user.

                                                           Central Processing Unit

                                                            Arithmetic Logic Unit

                             Input Devices                      Control Unit                    Output Devices

                                                                Memory Unit

                                              Answer the following questions:
                             uiz   Bee        1.   Which device is known as the brain of a computer?

                                                 ______________________________________________
                                              2.   What is the use of a keyboard?
                                                 ______________________________________________

                     OUTPUT DEVICES

                     The devices that display the results of processing done by the CPU are called
                     output devices. Output can be a printout from the printer, sound from the
                     speakers, image on the monitor or content on the projector. The most commonly

                     used output devices are printer, monitor, speakers, projector, plotter, etc.

                     Printer: A printer is an output device used to print text or pictures. There are three
                     types of printers: Dot matrix printer, Inkjet printer and Laser printer.

                           Dot Matrix                              Inkjet                                Laser

                                                                 21 st
                                                               Century   #Leadership & Responsibility
                                                                Skills
                                       “Take a printout only if it is necessary. By doing
                                       this, you can save trees. Ask your teacher, how
                                       can it be done?”

                                                                                                Hardware and Software  11

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