Fig. 2.1 shows a pumped storage scheme with an upper reservoir and a lower reservoir. At night, spare electricity from the grid is used to pump water from t...
Question 1 Report
Fig. 2.1 shows a pumped storage scheme with an upper reservoir and a lower reservoir. At night, spare electricity from the grid is used to pump water from the lower reservoir up to the upper one. In which store is this energy kept for use later?
Answer Details
The correct answer is gravitational potential energy of the raised water. When water is pumped to the upper reservoir, it gains gravitational potential energy (\( \Delta E = mg\Delta h \)) because of its increased height. This stored energy is released when the water flows back down through a turbine. Water does not store chemical or nuclear energy this way, and sound energy in the pipes is a loss, not useful storage.
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