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    Mouse: A mouse is an input device. We can send instructions to the
                                   computer by clicking on its buttons. It is also used to select objects and
                                   draw pictures on the screen.

                       Mouse

                      Joystick: A joystick is an input device used for playing games.

                                                                                                               Joystick

                                       Webcam: A webcam is an input device used to capture pictures or
                                       videos in digital form.

                        Webcam

                      Microphone: A microphone is an input device used to record voice,

                      music and other sounds on a computer.
                                                                                                             Microphone
                                           Light pen: A light pen is an input device used

                                           to point or draw on the screen.
                          Light Pen

                      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.

                       10   Premium Edition-III

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