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Water Falls, Power Flows
Age 14 · Physics
Water held high behind a dam has stored energy. As it falls and spins a turbine, that energy changes form until electricity flows through cables.
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In the picture
- High reservoir water: stored potential energy
- Falling water in the steep pipe: kinetic energy
- Turbine wheel and shaft: mechanical energy
- Generator and thick cables: electrical energy
Examples
- A ball held above the ground then dropped: its stored energy becomes motion.
- A bicycle dynamo rubbed by a wheel: spinning motion becomes electricity for a lamp.
Key takeaways
- Energy can change from one form to another, but it is not used up.
- In a hydroelectric plant, falling water turns turbines that drive generators.
Quiz: Water Falls, Power Flows (Age 14)
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What form of energy does water held high behind a dam have?
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What form of energy does falling water in the steep pipe have?
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What happens to energy as it changes form in a hydroelectric plant?
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