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GCSE Questions: Energy Sources

Q3. The diagram shows how the National Grid connects power stations to consumers.

(a) Explain the role of the two transformers, J and K, in the power transmission process and the reasons for their use.

[4 marks]

(b) In a pumped storage power station, water flows from a high level reservoir to a low level reservoir turning turbines and generating electricity. Pumped storage power stations do not supply electricity to the National Grid at all times of the day. The diagram belowshows a pumped storage power station.

(i) Explain how pumped storage power stations store energy for later use.

[4 marks]

(ii) Explain why pumped storage power stations are able to meet sudden large demands for electricity.

[2 marks]

(Total 10 marks)