HOTS Science Primary 6 Energy

A hydro-electric power station uses falling water to turn a turbine connected to a generator. What is the main energy conversion starting from the water at the top of the dam?

A Gravitational potential energy → Kinetic energy → Electrical energy
B Electrical energy → Kinetic energy → Potential energy
C Kinetic energy → Electrical energy → Potential energy
D Chemical potential energy → Kinetic energy → Electrical energy
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Worked Solution

Step 1: Water behind the dam is at a height, storing Gravitational Potential Energy. Step [2-9]: As it falls, it speeds up, converting GPE into Kinetic Energy. Step [2-9]: The moving water turns a turbine, which the generator uses to produce Electrical Energy.

Correct answer: Gravitational potential energy → Kinetic energy → Electrical energy

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