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Definition The rate (amount/time) of energy change, heat transfer, or work.

Notes

Example sentences The power of a small chain saw (rate of work) is about 2 hp = 1500 W = 1500 joules of energy/second. A 1000 W burner supplies 1000 joules of heat every second to a pan of waters. The power output of the engine affects how quickly it can accelerate the vehicle. Engineers measured the power of the turbine to determine its efficiency.