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

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Question 4

A wind turbine turns the coil of a generator at a constant speed. The coil rotates in a magnetic field and is connected to a complete external circuit with fixed resistance.

a.

Explain why the turbine must do work to keep the generator coil rotating at a constant speed.

[3]
b.

The magnets in the generator are replaced by stronger magnets. The speed of rotation and the circuit resistance stay the same. Explain how this change affects the work the turbine must do each second to keep the coil rotating.

[2]
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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