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

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Question 39

A technician tests two sealed generators, R and S. One generator is an alternator and the other is a dynamo. The coil in each generator is rotated at a steady speed.

The table shows the potential difference measured at the fixed output terminals during one complete turn of each coil.

Fraction of a complete turnPotential difference for R in VPotential difference for S in V
000
0.25+6.0+6.0
0.5000
0.75−6.0+6.0
1.0000

Explain which generator is the alternator and which is the dynamo, and how the difference in their construction produces the outputs shown in the table.

[4]
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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