Input Devices

INPUT DEVICES
Input devices accept data and instructions from the user.
Following are the examples of various input devices, which are
connected to the computer for this purpose.
1. Keyboard
2. Mouse
3. Light Pen
4. Optical/magnetic Scanner
5. Touch Screen
6. Microphone for voice as input
7. Track Ball

1- Keyboard
A keyboard (as shown in figure 1.3) is the most common input device. Several kinds of keyboards are available, but they resemble each other with minor variations. The keyboard in most common use is the QWERTY board. Generally standard keyboard has 104 keys. In
these keyboards, the cursor control keys are duplicated to allow easier use of the numeric pad.

2- Mouse
A mouse is an electro-mechanical, hand-held device.It is used as a pointer. It can perform functions like selecting menu commands, moving icons, resizing windows, starting programs, and choosing options. Mouse The most common mouse uses an internal, magnetically coated ball, to detect the movement of the mouse across a flat surface, usually a desktop. Now a days Optical or laser mouse is used to detect the movement. All windows based applications today are designed to work with a mouse. A mouse is used to replace hard
-to-remember key combinations with easier "Point and Click" actions. However, it cannot substitute all keyboard operations.
It can be alternative for commands based operations.