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    Microphone: A microphone is an input device used to record voice,
                     music and other sounds on a computer.

                                                                                                            Microphone

                                            Scanner: A scanner is an input device that reads text or images
                                            and sends their copies to the computer.
                          Scanner

                     PROCESSING DEVICE

                     The device which is used to process the input data is called a processing device. In

                     a computer  system,  the  Central  Processing  Unit (CPU) works as a processing
                     device. It controls the entire working of the computer system.

                     The parts of the CPU are:

                       Arithmetic Logic Unit (ALU): It performs all the arithmetic

                         operations such as addition, subtraction, multiplication,
                         division  and  all the  logical  operations  such  as  greater

                         than, less than, equal to, etc.                                           CPU Box        CPU

                       Control Unit (CU): It controls the working of all the parts of a computer.
                         It acts like a supervisor and is used to control the flow of information from

                         the CPU to other parts of the computer and vice-versa. 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

                                                                                                 Operating a Computer  27

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