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    3.9 CPU

                                     Aryan: You have discussed about all the devices, but still I don’t know
                                     about this device to which keyboard, mouse, monitor are connected.
                                     What is this?

                                     Gowri:This black box is CPU. We have discussed a little about this
                                     in the previous chapter, now I will tell you in detail. It is the part of
                                     computer which controls all the  other parts of computer

                                                                          Central Processing Unit
                                                                           Arithmetic Logic Unit
                                                      Input Devices                                  Output Devices
                                                                              Control Unit

                                                                              Memory Unit

                             Fig. 3.13                                         Fig. 3.14

                                               CPU is further divided into three parts

                             CU (Control Unit)            MU (Memory Unit)           ALU (Arithmetic Logical Unit)
                         It controls the processing     It is used to store data.    It handles both arithmetic and
                                  of computer.                                                logical operations.

                     3.10 UPS

                         Aryan: What is the other device which we switch on before CPU?
                         Gowri: This is called UPS.

                         It’s  full  form  is  Uninterruptible  Power  Supply.  It  provides  battery
                         backup when the electrical power fails for some time.
                                                                                                          Fig. 3.15
                     Let us revise what we have learnt:

                          The Desktop is the first screen seen after turning on the computer.
                          Peripherals are devices connected to the computers.

                          Input devices include the keyboard  mouse, and touchscreen.
                          Output devices include the monitor, printer, and speakers.

                          The  Start button  and taskbar provide access  to  programs,  settings, and
                          shutdown options.

                                                                   Desktop and Computer Peripherals                     33

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