Paper 1 · People, Development and Environment
On which principle does a hydroelectric power plant work?
AThe law of conservation of energy
BThe conversion of potential energy into kinetic energy
CThe conversion of mechanical energy into electrical energy
DAll of the above ✓ Correct
Correct answer: (D) All of the above — A hydroelectric plant works on all of these principles, so the answer is all of the above.
Explanation
★A hydroelectric plant works on all of these principles, so the answer is all of the above.
★Stored water high in a dam has potential energy, and energy is conserved throughout.
★As the water falls, its potential energy becomes kinetic energy.
★The moving water turns turbines, changing mechanical energy into electrical energy.
★So all three principles are at work in a hydroelectric plant.
★So the answer is all of the above.
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