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7.3 Induced potential, transformers and the National Grid (HT only)

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Question 10

Water turns the coil of a small hydroelectric generator in a magnetic field. When the generator's output is connected to a complete circuit, the water must do more work to keep the coil turning at the same speed than when the output is disconnected.

Which statement explains why?

[1]
A

The magnet's field becomes stronger when the circuit is connected to the generator.

B

The resistance of the circuit produces a friction force on the coil as it turns.

C

The induced current produces a magnetic field that opposes the rotation of the coil.

D

A potential difference is induced across the coil only when the circuit is complete.

Markscheme

7.3 Induced potential, transformers and the National Grid (HT only) Questions

  1. GCSE
  2. /Physics
  3. /7.3 Induced potential, transformers and the National Grid (HT only)

96 exam-style questions on AQA GCSE Physics 7.3 Induced potential, transformers and the National Grid (HT only), covering 7.3.1 Induced potential (HT only), 7.3.2 Uses of the generator effect (HT only), 7.3.3 Microphones (HT only), and 7.3.4 Transformers (HT only). Each one has a worked solution and a mark scheme showing where the marks go.

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