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1. Geothermal
power stations use energy from the natural decay of
radioactive substances in the
Earth.
2. Tidal power stations affect the environment because river estuaries
have to be flooded.
3.
Hydroelectric power station requires the building of a
dam on an upland river valley.
4.
Hydroelectric power station stores energy from surplus
electricity.
5. a) Energy transformation in
hydroelectric power stations:
Gravitational potential energy 
Kinetic energy
Kinetic
Electrical
(stored in
water) (falling
water)
(turbine) (Generator)
b) Energy
transformations in solar cells:
Light energy
Electrical energy
c) Energy transformations in
wind turbines:
Kinetic
Kinetic
Electrical
(Wind)
(turbine) (Generator)
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