Flashcards
Chapter 4 - Input Devices
Cards in this deck (12)
- 1InputAnything that a user clicks or scans to communicated with the computer.
- 2End UserThe person using the computer and doing the inputting.
- 3BarcodesA 2D image made up of black and white bars which can be translated into binary for a computer using a scanner.
- 4Barcode ScannerUsed to read and translate a QR code.
- 5QR CodeA 2D image made up of black and white squares which translate into binary code.
- 6Laser ScannerThey use a laser as a light source and a photo diode to measure the intensity of light reflected in order to generate a waveform to measure widths of bars/spaces in a barcode
- 7Imaging ScannerUses a camera and image processing techniques to decode a 1D or 2D bar code.
- 8CCDA sensor which tends to produce higher quality images.
- 9CMOSA sensor comprising of millions of tiny light sensors arranged in a grid. Tends to produce lower quality images than a CCD.
- 10RFIDUses both input and output. It can read an RFID tag without line of sight and from 300 meters away.
- 11Passive TagsCheaper to produce tags as they do not have a battery. They rely on radio waves emitted from a read to provide sufficient electromagnetic power to the card.
- 12Active TagsPhysically larger and include a battery to power the tag so it actively transmits a signal for a reader to pick up.
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- A level Computing Flashcards on Chapter 4 - Input Devices, created by Joshua Davis on 17/09/2022.
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- Joshua Davis
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