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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.
(a) High tide, is the name given to the condition of the sea when its water is raised.
(b) Low tide, is the name given to the condition of the sea when its raised water recedes.
Explanation
A high tide is created when the moon’s pull is the greatest, whereas when the pull is the weakest, a trough or low tide is created.
(c) Tidal Energy, is the name of the form of energy that can be harnessed from natural phenomenon.
(d) A labelled diagram is given below, to show how 'tidal energy' can be harnessed to generate electricity.
Explanation
The power of the high tide and low tide (rise and fall of the sea level) can be used to generate electricity.
During high tide, when the level of water in the sea is high, sea-water flows from the sea into a reservoir of the barrage and rotates the turbines. Then, the turbines turn generators to produce electricity. And, during low tide, when the level of sea-water is low, the sea-water stored in the barrage reservoir is allowed to flow out into the sea, which also turns the turbines and produces electricity.
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