Input Devices

Touch screen An input device in the form of a monitor screen that responds when touched by the user.

Tracker ball A cursor control input device that has a ball on top that is moved by the user’s fingers.

Barcode Reader An optical input device that uses the reflection of a light beam to read barcode labels.

Digital Camera An input device for taking pictures that has an electronic lens and uses electronics for storing the images rather than chemical film.

Microphone An input device used for sound.

Joystick A cursor control input device with an upright arm. It is commonly used for controlling fast moving objects in computer games.

Graphics Tablet A graphical input device that tracks the movement of a stylus across a flat surface.

Scanner An optical input device that uses the reflection of light to copy text or graphics into a computer.

Reading : input devices Each text describes one of these devices : tracker ball, joystick, light pen, scanner. Identify the device each text describes. Write your answers in this table.then compare your answers with other students. A is another input device you can connect to a computer system the is able to move in eight directions. s are mostly used in computer games to control the way a picture on the screen moves . Sometimes two s are connected to a computer so two people can play the game at the same time. Joystick Joystick Joystick 1-

A works in exactly the same way as a mouse,except that the ball is on top. The user rolls the ball around with her hand to operate it. If you use a ,you don’t need any extra space on your desk to move it around (like you do with a mouse). s are often used on small portable computers and on some video game machines. Tracker ball Tracker ball Tracker ball 2-

A can be used to draw pictures directly on to a computer screen or to read the pattern on a barcode. A that can read barcodes detects the difference between the light reflected from a black barcode line and its lighter background. Light pen 3-

Using a , you can input printed drawings, photographs, or text directly into a computer. A works like a photocopier – light is shone on the material and the detects the reflected light. You can use a with optical character recognition (OCR)software to input the scanned text into a word processing package. scanner scanner scanner scanner 4-

Match each device (1-7) with its use (a-g) 1- joystick. 2- light pen. 3- scanner. 4- digital camera. 5- mouse. 6- keyboard 7- microphone. Use A- draw pictures on to a computer screen. B- copy documents. C- input sound. D- input text. E- select from a menu. F- move the cursor rapidly. G- produce photos without film.

In groups, decide which input device is best for:- Problem-solving In groups, decide which input device is best for:- 1- controlling fast-moving objects in a game. 2- reading the price of things in a shop. 3- making copies of a page of text and graphics. 4- storing sounds on a computer. 5- producing pictures of people and places for storing in a computer. 6- controlling a computer using speech.. 7- typing text into a computer. joystick barcode reader scanner microphone digital camera keyboard

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