Question

Write one limitation on harnessing tidal energy

Answer 1

the tidal energy is not likely to be a potential source of energy in future due to the following limitations 
⇒less availablity of suitable sites for building tidal barrages around the world
⇒the rise and fall of sea water during high and low tides is not enough to generate electricity on a large scale
⇒start up costs to build a tidal energy plant is high

Answer 2

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a) Tidal energy: The energy produced by the surge of ocean water during high and low tides due to difference in sea-levels is called tidal energy. The high and low tides occur due to the gravitational pull of the moon. This causes enormous movement of water.

(b) Tidal energy is harnessed by constructing a dam near the shores. During the high tides water flows into the dam and during the low tides, water flows out. This flowing water rotates the turbine, present at the opening of the dam and produces electricity.