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13.2 Transformers and the National Grid

13.2 Transformers and the National Grid

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Question 1

A remote deep-sea research outpost is powered by an offshore tidal turbine station. Before transmission along the subsea cable, a step-up transformer is used to increase the voltage.

Which of the following statements correctly explains the physical benefit of transmitting power at this high voltage?

  • The electrical resistance of the subsea cable is reduced to zero.
  • The current in the cable is decreased, reducing the rate of thermal energy transfer to the surroundings.
  • The total electrical power generated by the tidal turbine is increased.
  • The alternating current is converted to direct current to eliminate electromagnetic induction in the water.
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Markscheme

13.2 Transformers and the National Grid Questions

  1. GCSE
  2. /Physics
  3. /13.2 Transformers and the National Grid

28 exam-style questions on Edexcel GCSE Physics 13.2 Transformers and the National Grid. Each one has a worked solution and a mark scheme showing where the marks go.

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