3. (a) Write three basic functions of different input devices.
Answers
Answer:
Joystick,
Joystick is also a pointing device, which is used to move the cursor position on a monitor screen. It is a stick having a spherical ball at its both lower and upper ends. The lower spherical ball moves in a socket. The joystick can be moved in all four directions.
Light Pen,
Light pen is a pointing device similar to a pen. It is used to select a displayed menu item or draw pictures on the monitor screen. It consists of a photocell and an optical system placed in a small tube.
Track Ball,
Track ball is an input device that is mostly used in notebook or laptop computer, instead of a mouse. This is a ball which is half inserted and by moving fingers on the ball, the pointer can be moved.
Answer: Write three basic functions of different input devices.
Explanation: Input devices perform three main functions: Input devices Receive data from user. For example, user enters data from keyboard by typing numeric number 5 Input devices Convert data into binary form [the language of 0 and 1 also called the machine language. Machine language is the only language, a computer can understand directly.