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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        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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