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GCSE Questions: Energy Sources

Q20. (a) The diagram shows how the National Grid connects power stations to consumers.

Name the parts of the National Grid labelled K, L and M.

K = step-up transformer

L = transmission or power cables

If you said 'wires' they gave you no mark - these are 'big wires' - cables!

M = step-down transformer

If you just labelled K and M 'transformer' but step-up and step-down labels were incorrect or not present you just got 1 mark for saying 'transformer'

[3 marks]

(b) The bar graph shows how the percentage of electricity generated by gas-fired power stations changed in the UK over the five years from 2014 - 2018.

Calculate how many times greater the percentage of electricity generated by gas-fired power stations was in 2018 than in 2014.

See the graph

- in 2018 - 32%

- in 2014 - 8%

32% ÷ 8% = 4

Four times greater

[2 marks]

(c) Explain one environmental effect of generating electricity using a gas-fired power station.

[2 marks]

(d) The UK government wants more electricity to be generated using renewable energy resources.

Choose from the four defiitions below the one that best explains what a renewable energy resource is.

Tick your choice.

An energy resource that can be burned  
An energy resource that can be recycled  
An energy resource that can be replenished quickly
An energy resource that can be reused  

 

(e) An offshore wind farm is a group of wind turbines that are placed out at sea.

The graph below shows the power output of an offshore wind farm compared with a wind farm on land for a 24-hour period.

Give two advantages of the offshore wind farm compared with the wind farm on land. Use information from the graph.

An offshore wind farm produces a higher power output and a lower variation in power output than a wind farm on land does, so it will generate more electricity.

[2 marks]

(Total 10 marks)