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    Very good! Each part plays a different
                                                                                         role. Similarly, a computer also has
                                                                                          many parts. Some are outside and
                                                                                        some inside the CPU box. Let us learn
                                                                                                    about them.

                      Test Your Knowledge                                                   21 st  Century   #Critical Thinking
                                                                                                Skills
                                                                                                    #Technology Literacy
                       Write the missing element of the IPO cycle for the use of the following machines with the
                       help of given hints.

                                                    Hints Ready Juice, Cooking and heating

                                     MACHINE                         INPUT           PROCESSING            OUTPUT

                                              Microwave         Rice and Water                           Ready to eat

                                                                                     Churning and
                                                 Juicer        Carrots, Oranges
                                                                                    extracting juice

                     Now you know that a computer works on the IPO cycle. To follow this IPO cycle it uses

                     some devices. Let us learn about them in this chapter.

                     INPUT DEVICES

                     The devices that are used to give commands or instructions to the computer and tell
                     the computer what to do are called input devices. Let us learn about some of them.

                                                                                                         IPO Devices   29

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