Q41 of 269 Page 149

Which of the following is not a consequence of establishing hydroelectric power plants ?

The cost of hydroelectricity is relatively low, making it a competitive source of renewable electricity. The hydro station consumes no water, unlike coal or gas plants.

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39

Geothermal energy is produced by the:

 40

The harnessing of which of the following leads to the destruction of large eco-systems?

 42

A certain form of energy is available due to the difference in the temperature of water at the surface of the ocean and its deeper levels.

(a) Name the form of energy.


(b) Is this energy ultimately derived from the sun or not?


(c) Explain how this form of energy can be converted into electricity.


(d) What is the minimum temperature difference in water at the surface of ocean and its deeper level which is required to operate power plants based on this energy ?

 43

The gravitational pull of the moon causes the sea-water to rise periodically.

(a) What name is given to the condition of the sea when its water is raised?


(b) What name is given to the condition of the sea when its raised water recedes?


(c) What name is given to the energy which can be harnessed from this natural phenomenon?


(d) Draw labelled diagram to show how this energy can be harnessed to generate electricity.