Page 13 - KEC Khaitan C3 Flipbook
P. 13

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



                                          1.   Which device is known as the brain of a computer?
                         uiz   Bee           ______________________________________________

                                          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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