Question 17: Write two different ways of harnessing energy from the ocean.
Answer:
There are mainly three different ways of harnessing energy from the ocean:- Tidal energy, Wave energy and Ocean thermal energy.
Two ways are following:-
1. Tidal Energy:- The level of water in the sea rises and falls by the gravitational pull of mainly the moon on spinning earth, and this is called high and the low tides. And the difference in between the high and low tides is known as tidal energy. This energy is obtained by constructing a dam across the narrow opening to sea and a turbine is fixed which converts tidal energy to electricity.
2. Ocean Thermal Energy:- Water at the surface of the sea is heated by sunlight but the deeper water is cold in sea. This energy is obtained from the temperature difference in ocean thermal energy conversion plants. The warm surface of water is used to boil the volatile liquid and then these vapours of liquid like ammonia. These vapours are then used to run the turbine of the generator. And, the cold water from the deeper section of the sea or ocean pumped and condenses vapours again into liquid.
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