(a) Hydropower harnesses the energy contained in flowing water to produce electricity. Water stored at a certain height possess potential energy which is allowed to run down increasing its kinetic energy which is utilized to produce electricity.
(b) 1 MW is a unit of Power. It reflects the consumption of energy per unit time.
1 MW = 1000000 W or 1000 kW
(c) Construction of Tehri dam results into:
(i) Submersion of land and vegetation.
(ii) Construction of large dams results in displacement or relocation of the villagers and communities on a massive scale.
(d) Water when allowed to fall from great height possess kinetic energy at the expense of potential energy on the blades of turbine moving it at great speed; producing electricity.
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