Exam-style question
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Compare a barcode reader and an RFID system for identifying items in a stock-control system. Discuss how each operates and give a suitable use or limitation for each.
Model answer
What a good answer should say
- A barcode reader uses light to scan a printed barcode and converts the pattern into data.
- It is suitable where items already have visible printed codes, such as products at a checkout, but the code normally needs to be presented to the reader so that it can be scanned.
- An RFID system uses radio communication between a reader and an RFID tag.
- It is suitable for identifying tagged items as they move through an area, because the reader does not rely on optically scanning a visible printed code.
Explanation
Why this works
A strong answer compares both the operating principle and the suitability of each device. The key distinction is optical scanning of a printed code for a barcode reader versus radio communication with a tag for RFID.
Applying these differences to a stock-control context demonstrates why one system may be preferred over the other.
Common mistake
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