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    Microphone

                                      A microphone is an input device that is used to record voice, music
                                      and sound into the computer system.

                     Microphone
                     Touchscreen

                     A touchscreen is a screen sensitive to touch. You can interact
                     with  a  computer  by  touching  areas  on  the  screen.  Tablets,

                     smartphones, ATMs have touchscreen in them.
                                                    Touchpad
                                                                                                        Touchscreen
                                                    A touchpad is a flat, touch-sensitive
                                                    surface  commonly found on laptops. It acts as an

                                                    alternative to a mouse, allowing you to control the cursor

                            Touchpad                by moving your finger across it.

                           PROCESSING DEVICE

                     Processing is done  on the data  entered into the computer,  to convert  it into

                     meaningful information through a processor.

                     CPU

                     CPU (Central Processing Unit) is a processor, sometimes called a microprocessor.

                     It  is the  brain  of  the  computer  that  does  all  the  calculations  and  runs  all the

                     programs. It manages all the operations and carries out the basic instructions which
                     operate a computer. The three main components of CPU are:

                        ALU (Arithmetic Logic Unit): Performs mathematical and logical operations.

                        CU (Control Unit): Directs all the
                                                                                                         Memory Unit
                        operations of a processor.

                        MU (Memory Unit):  Stores data
                                                                                                         Control Unit
                        and  instructions.  The  memory of
                        the CPU is  a temporary  storage
                                                                                                             ALU
                        area.
                                                                        CPU box           CPU        Functioning of CPU

                                                                                                 Computer Devices         9

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