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Flashcards in Input devices Deck (7):
1

Touch screen work?

There are crisscrossing beams of infrared light in front of the monitor. The computer detects the position of the finger and responds accordingly.

2

What are light pens?

A light pen is a computer input device in the form of a light-sensitive wand used in conjunction with a computer's CRT TV set or monitor. It allows the user to point to displayed objects, or draw on the screen, in a similar way to a touch screen but with greater positional accuracy.

3

4 uses of webcams

1. Video calling and conferencing
2. Video security
3. Video clips and stills
4. Input control devices

4

Disadvantages of magnetic strip codes.


The cards can easily be damaged, especially by magnets. If this happens the card will no longer be readable.

5

Digital cameras?

Digital cameras have a built-in computer and record images electronically where conventional cameras depend on mechanical/chemical processes to capture images and print it on film or paper.

6

Bar code scanners work?

A bar code consists of a number of black and white stripes of different thickness. A bar code reader reads the light reflected from the dark and light lines. The lines represent numbers and are read by a wand or scanner.

7

Application of OCR?

One application of OCR is reading postcodes on letters when sorting the letters.