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

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Question 17
H

A generator is connected to a lamp. When the lamp lights, the generator becomes harder to turn. Which statement explains this?

[1]
A

The lamp draws a current, which strengthens the field of the magnets

B

A current flows in the coil and its field opposes the rotation of the coil

C

The coil warms up, so its resistance rises and more work must be done

D

The slip rings rub on the brushes, which increases the friction on the coil

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)

40 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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