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Grade: 11

                        

A hydroelectric plant generates electricity because water falls under gravity through a turbine, thereby turning the shaft of a generator. According to the mass-energy concept, must the appearance of energy (the electricity) be identified with a mass decrease somewhere? If so, where?

5 years ago

Answers : (1)

Kevin Nash
askIITians Faculty
332 Points
							No, the appearance of energy must not be identified with a mass decrease.
In a hydroelectric plant, when the water falls under gravity, the potential energy of the water first converted into kinetic energy. Then this kinetic energy will move the turbine and the moving turbine will convert the kinetic energy to electrical energy. Thus, it is just an energy transfer from one form to another. Therefore, there is no loss of mass which appears in energy.
5 years ago
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