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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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Transformers and the national grid Questions

Practise Edexcel GCSE Physics Transformers and the national grid with exam-style questions for Foundation and Higher tier. 47 questions, matched to the Edexcel GCSE Physics (1PH0) specification and written in Paper 1 and Paper 2 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.

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Transformers and the national grid Questions

  1. GCSE
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  3. /Transformers and the national grid