Supply and demand
2 marks · EasyElectricity suppliers must match supply exactly to demand to avoid power cuts.
State one way electricity demand can change suddenly.
Name a type of power station that is usually used to deal with these sudden changes.
Work this out on paper, then compare with the answer and worked solution below. With a free account you can submit written answers for marking.
Show answer
(a) Large numbers of people turn on electric kettles at the same time, e.g. during TV advert breaks
(b) Hydroelectric power station (or gas-fired power station)
Common mistakes: Solar power station; Nuclear power station for b
Show mark scheme and worked solution
Marking points
B1 (a) · 1 mark · States a valid example of a sudden change in demand
B2 (b) · 1 mark · Names a suitable power station type (hydroelectric or gas-fired)
Worked solution
a) An example is a popular TV show finishing and viewers turn on appliances together. b) Hydroelectric power stations or gas-fired power stations can deal with these changes quickly.