Non-renewable energy resources
3 marks · EasyA hydroelectric power station is a renewable energy resource.
State the main energy store in water held in the reservoir before it flows down.
Explain why hydroelectric power is described as renewable.
State one disadvantage of using hydroelectric power stations.
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) Gravitational potential energy
(b) Water cycle replaces the water naturally.
(c) Can cause environmental damage such as flooding habitats.
Common mistakes: Hydroelectric power causes no environmental issues
Show mark scheme and worked solution
Marking points
B1 (a) · 1 mark · Gravitational potential energy identified as main store.
B1 (b) · 1 mark · Explains that water is naturally replaced (e.g., water cycle).
B1 (c) · 1 mark · States a valid disadvantage (e.g., environmental impact, flooding habitats, high initial cost).
Worked solution
a) The main energy store is gravitational potential energy. b) Hydroelectric power is renewable because the water is replaced by the natural water cycle (e.g., rainfall). c) One disadvantage is flooding of habitats or displacement of people.