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Power measures the rate of energy transfer or work done per unit time. The SI unit is the watt (W = J/s). Power converters convert between watts, kilowatts, horsepower, BTU/hr, and calories/second.

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1. 11 watt = 1 joule/second
2. 21 kilowatt (kW) = 1,000 W
3. 31 mechanical horsepower (hp) = 745.7 W
4. 41 metric horsepower (PS) = 735.5 W
5. 51 BTU/hr = 0.2931 W

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