Energy resources: hydroelectric

Question 1

How does it work?

Answer 1

• water falls from a reservoir
• water turns a turbine
• turbine generates electricity
• electricity leaves power station to national grid
• some energy is used to pump water buck up to the reservoir

Question 2

Stores and transfers

Answer 2

gravitational ->mechanical-> kinetic ->mechanical-> kinetic ->electrical->

Question 3

Advantages

Answer 3

• renewable
• no carbon dioxide emissions
• can be produced on demand
• free energy source
• very efficient

Question 4

Disadvantages

Answer 4

• expensive set up
• takes up lots of space, destroying habitats
• location dependent