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Microphone

                 A microphone is an input device. It is used to record voice, music and sounds
                 that can be stored in a computer.




                                             Web Camera
                                             A web camera is used to take pictures in digital form and store
                                             photographs in the computer. It is also known as webcam.




                 Light Pen

                 A light pen is used to point to objects or draw on the screen in a way
                 like a touchscreen.


                      Processing Device

                 The CPU (Central Processing Unit) is the 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.
                 CPU is also called the “brain” of a computer as it is responsible for all the work done.

                 A CPU is further divided into three parts: ALU, CU and MU.


                                                   Arithmetic Logic Unit (ALU)

                                                   ALU does  all the  arithmetic  calculations  like  addition,
                                                   subtraction,  multiplication,  division,  etc.  It also  does
                                                   comparisons like greater than, less than, equal to, etc.
                    CPU
                                      CPU Box

                 Control Unit (CU)

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

                 Memory Unit (MU)                                                                   Control Unit

                 The CPU also has a memory like human beings. It stores the data
                 and instructions  that  you  give  to  the  computer  along with the               Memory Unit
                 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.


                                                                                                 Computer System   9
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