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One gallon of power is approximately 8.3 pounds, so the energy released, when 1 gallon of water falls 10 feet, is 83 foot-pounds, which is equal to 0.31 watt-hrs.

If this energy were mechanically converted to electrical energy, approximately 40% losses would occur in converting the falling water into rotational, mechanical energy by a Pelton wheel or other water impeller, and about a 5% loss in conversion of rotational energy to electrical energy by a generator. So the extracted energy would be about 50%. Of that 0.31 watt-hours of energy, about 0.15 watt-hours would be delivered in the form of electrical energy, and the other 0.15 watt-hours would be lost in the form of heat.

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