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IPO Cycle

                 A Computer takes the data as input, processes and then gives result as an output.


                              Input                            Process                           Output
                             3, 6, +                             3 + 6                               9

                              Data                                                            Information














                         Input devices                   Processing device                  Output devices

                                                              IPO Cycle
                     INPUT DEVICES

                 A computer accepts data and instructions from you through input devices. Data can
                 be in the form of numbers, text, sound or graphics. Some of the input devices are:
                 Keyboard

                 A computer  keyboard  is the  main

                 input device for computers. You can
                 press the keys on it to input data in
                 the form of words and numbers.

                 A standard  keyboard  has 104 keys,
                 which can be classified as follows:

                    Alphanumeric keys (A–Z, a–z, 0–9)
                                                                                         Keyboard
                    Control keys (Ctrl, Alt, Esc, etc.)
                    Function keys (F1–F12)

                    Special keys (Caps Lock, Backspace, Spacebar, Arrow keys, Home, End, etc.)

                    Punctuation keys (“ , ” , “-”, ; , etc.)
                 Mouse

                 It is a pointing  device  that  allows you  to put  data  into a
                 computer  by  using the  point,  click and  drag and  drop
                 commands. It controls the movement of the pointer on the

                 screen. It is used to move and select icons, files and folders
                 on your computer. It can also be used to draw pictures.                              Mouse



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