This activity models a railway track-circuit signalling system. Train wheels and axles provide an electrical connection between the two rails on which they travel. This enables a track signalling circuit to detect the presence of a train on a given section of track.
Students use their existing knowledge of resistors combining in parallel, and of internal resistance, to explain its operation.
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This would be most useful for transport on track the edexcel A2 unit. The practical physics website is great, with enough detail to be able to do the practical.
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