Computer Peripherals Essay

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Computer Peripherals 1. Input Devices Input devices are used to capture the data and transmit it to the computer system for further processing and in computer readable form. Some of the input devices are as under: a) Keyboard Devices: keyboard devices are the most commonly used devices today. They allow data entry into a computer system by pressing a set of keys, which is connected to a computer system. Programs and data are entered into a computer through a keyboard. A keyboard is similar to a typewriter it contains Alphabets,digits,special chars and some control keys. When a key is pressed an electrical signal is produced which is detected by an electronic circuit called keyboard encoder. Its function is to detect which key has been pressed and send binary code for it. b) Point-and-Draw Devices: 1. Mouse: Mouse is the most popular point-and-draw device today. A mouse is called a pointing device. It moves across a flat surface with the help of tracking balls. Its movement and the direction of the movement is detected by two rotating wheels on the underside of the mouse called sensors. 2. Light Pen: A Light pen is a pointing device. It is used to select and write the text on the CRT. It is capable of sensing a position on the CRT screen when its tip touches the screen. 3. Trackball: A Trackball is a pointing device, similar to a mouse. The ball is placed in the base of a mouse, is placed on the top along with the buttons. To move the cursor around the screen the ball is rolled with the fingers. because the whole device is not moved. The cursor is often attached to or built into the keyboard. Trackballs built into the keyboard are commonly used in laptop(notebook) computers. because a mouse is not practical for laptop users in a small place.

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