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Joystick

                 Joystick is a pointing device that is used to control the movement

                 of a pointer on your computer screen. It is mostly used to play
                 games on the computer.





                                   Microphone                                                            Joystick


                                   It is an input device that is used to record voice, music and sound
                                   into the computer system.



                  Microphone
                 Touchscreen

                 A touchscreen is a screen sensitive to touch. We can interact

                 with a computer by touching areas on the screen. Tablets,
                 smartphones, ATMs have touchscreen in them.

                                                                                                  Touchscreen

                     PROCESSING DEVICE

                 Processing is done  on  the  data  entered  into  the  computer  to  convert  it into
                 meaningful information through a processor.

                 CPU


                 CPU (Central  Processing Unit)  is
                 a  processor, sometimes  called a                                                  Memory Unit
                 microprocessor. It is  the brain

                 of the computer that does all the
                                                                                                    Control Unit
                 calculations, and runs all the programs.
                 It manages all the operations and
                 carries out the basic instructions that                                                 ALU
                 operate a computer. The three main
                                                                      CPU box          CPU      Functioning of CPU
                 components of the CPU are:
                    ALU (Arithmetic Logic Unit):  Performs mathematical and logical operations.

                    CU (Control Unit): Directs all the operations of a processor.
                    Memory Unit: Stores data and instructions.







                                                                                      The Computer—An Overview     9
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