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Input Devices

                 Input devices help give instructions and feed data into a computer. They allow you communicate
                 with computer and operate the computer. Some of the examples of input devices:
                    Keyboard: It is the main input device used with
                    computers. It allows you to type letters, numbers,
                    and  symbols, which  the  computer  can  then
                    process. When you press a key on the keyboard,
                    the  computer  receives  this input  and  shows the
                    corresponding character on the screen. The keyboard has different keys, which are as follows:
                    a.  Alphabet Keys: Used to type letters (A-Z or a-z).
                    b.  Number Keys: Used to type numbers (0-9).

                    c.  Enter Key: Used to start a new line or execute a command.
                    d.  Spacebar: Used to insert spaces between words.
                    e.  Arrow Keys: Used to move the cursor around on the screen.
                                Mouse: It is a pointing device used to  interact  with  the  items on  a  computer
                                screen. It helps you select, click, and move things around on the screen, making
                                it easier to control the computer. When you move the mouse on a flat surface, a
                                slanted arrow moves on the screen in the same direction. This is called the mouse
                                pointer.

                    Following types of mouse clicks can be done:
                    a.  Left-click:  Pressing  and  releasing  the  left  mouse button  once  quickly is called  the
                        left-click. It is used to select or open an item.
                    b.  Right-click: Pressing and releasing the right mouse button once quickly is called the
                        right-click. It opens a context menu with more options for the selected item.
                    c.  Double-click: Pressing and releasing the left mouse button twice quickly is called the
                        double-click.

                    Light Pen: It is a handheld input device that allows users to interact
                    with a computer screen by directly pointing at it. It detects the light
                    emitted from the screen and can be used to draw, write, or select
                    items on the display.
                                          Touch Screen: It is an input device that allows users to interact with a
                                      computer or device by directly touching the screen by fingers. Instead of
                                      using a keyboard or mouse, you can simply touch icons, buttons, or menus
                                      on the screen to give commands, enter data, or navigate through the system.
                    Smartphones, Automated Teller Machines (ATMs), and tablets use touch screens.
                    Microphone: It is an input device that captures sound and converts it into
                    digital data that a computer can process. It allows users to input voice or
                    other sounds into the computer and converts them into digital form that
                    can be stored, processed, or transmitted. In virtual assistants like Siri or
                    Google  Assistant,  microphones  capture  your  voice  so the  assistant can
                    understand and respond to your commands.



                                                                                    Fundamentals of Computer     13
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