Supply and demand
2 marks · EasyA table gives the start-up times for different types of power station: | Type | Start-up time | |------------------|--------------| | Nuclear | 24 hours | | Coal-fired | 6 hours | | Gas-fired | 30 minutes | | Hydroelectric | 2 minutes | Which type of power station(s) could be used to deal with a sudden demand for electricity during a football match interval? Give a reason for your answer.
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Hydroelectric and gas-fired power stations could be used because they have the shortest start-up times.
Also accept: Hydroelectric, because it starts up in 2 minutes; gas-fired, because it starts in 30 minutes.
Common mistakes: Coal-fired power stations; Nuclear power stations
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Marking points
B1 · 1 mark · Identifies hydroelectric and/or gas-fired power stations
B2 · 1 mark · Gives valid reason based on short start-up times
Worked solution
Hydroelectric and gas-fired power stations can be used because they can be started quickly (in minutes or less).