4223816
Description
Flashcards by Derek johnson, updated more than 1 year ago
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Created by Derek johnson
over 8 years ago
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| Question | Answer |
| what does ocr mean | Optical Character Recognition Optical Character Recognition, or OCR, is a technology that enables you to convert different types of documents, such as scanned paper documents, PDF files or images captured by a digital camera into editable and searchable data. |
| what do bar code readers do | These devices shine a laser on a barcode. The lines on the barcode are translated into numbers. They are commonly used in shops when you go to the checkout |
| what do scanners do | A scanner is used to transfer printed documents onto a computer The document is placed onto the scanning surface. The scanning head passes over it and makes an electronic image |
| what do Magnetic stripe readers do | A scanner is used to transfer printed documents onto a computer The document is placed onto the scanning surface. The scanning head passes over it and makes an electronic image |
| what do Chip and PIN readers do | Credit cards have the PIN data stored in an encrypted format on a chip that’s embedded in the card. It is encrypted to stop the PIN being read if someone steals or finds your card. |
| what do Sensors do | Sensors are designed to measure things like heat, light, noise or movement They turn the measurement into digital data (numbers) which are transmitted to the computer via the connection e.g. USB |
| what do Remote Controls do | Remote Controls are input devices The user presses a button e.g. ‘Play’ and that data is sent to the computer Older remote controls use infra-red beams to transmit data from the remote to the computer |
| what do Projectors do | This projects a display onto a large screen or flat surface Projectors are used in classrooms, display areas and home cinemas |
| what do Plotters do | This is a specialist type of printer that generates very large architectural drawings and CAD images |
| what do Activators do | This is a hardware device which carries out a physical movement when sent a signal Activators are used in robotics, CAM (Computer Aided Manufacturing) and home automation systems. |
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