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Processing Device

                 The CPU (Central Processing Unit) is a processing device

                 that works on input and sends the result to the output
                 devices.  The CPU is a chip which is placed inside the CPU
                 box/Cabinet.
                 The CPU is also called the “brain” of a computer as it is

                 responsible for all the work done. It is further divided             CPU         CPU Box/Cabinet
                 into three parts: ALU, CU and MU.
                                                                                                        CPU
                 Arithmetic Logic Unit (ALU)                                                    Arithmetic Logic Unit


                 The  Arithmetic Logic  Unit (ALU)  does  all  the  arithmetic
                 calculations like addition, subtraction, multiplication, division, etc.
                                                                                                    Control Unit
                 It also does comparisons like greater than, less than, equal to, etc.

                 Control Unit (CU)                                                                  Memory Unit


                 The Control Unit (CU) coordinates and controls all the parts of the CPU. The CU gets
                 the data and instructions from the memory unit and it passes them to the ALU in a
                 step-by-step manner.

                 Memory Unit (MU)

                 The CPU also has a memory like human beings. The Memory Unit (MU) stores the data
                 and instructions that you give to the computer along with the results of the processing.

                 Output Devices


                 The result we get after processing is called Output. The devices which help us to get
                 these results or  outputs are  called  output  devices. Let  us study about  some of the
                 commonly used output devices.
                 Monitor


                 A  monitor looks  like  a television. It is  also known as a  Visual
                 Display Unit or VDU. The monitor shows the data that you input
                 and its result (output) after the computer processes it.


                                                                                                      Monitor

                                            Speakers

                                            Speakers are used to hear music, voice and sound on a computer.


                        Speakers






                                                                                                                  9
                                                                                            A Computer System
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