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    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 /Cabinet       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

                                              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.

                                                                                                Hardware and Software  11

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