(a) Explain how tidal energy can be used to generate electricity?
(b) Why is tidal energy not likely to be a potential source of energy?
(a) 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.
(b) Tidal energy is not likely to be a potential source of energy because of the following reasons:
1. There are very few sites around the world that are suitable for building tidal barrages.
2. The rise and fall of sea-water during high and low tides are not enough to generate electricity on a large scale.
Image is posted for reference only.
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