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Switching puzzles

Hidden in the walls of your home and school are some cleverly designed circuits that use switches to control lights, heaters, fans and other devices. How do they work?

The terms in bold link to topics in the AQA, Edexcel, OCR, WJEC and CCEA A-level specifications, as well as the IB, Pre-U and SQA exam specifications.

Various types of switch are used to control electric circuits. Many can be explained using circuit diagrams. Temperature-controlled switches exploit thermal expansion of metals.

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Previous

Balancing bridges

Next

Clues

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