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13 cards from this deck
Rate at which work is done or energy is transferred
P=WtP = \frac{W}{t}P=tW
P=EtP = \frac{E}{t}P=tE
Watt (W)
James Watt
1 joule per second
How well a device converts input energy to useful output energy
Useful Power OutputPower Input×100%\frac{\text{Useful Power Output}}{\text{Power Input}} \times 100\%Power InputUseful Power Output×100%
Speed or rate at which work is completed
Heat, sound, and friction
Work and energy transfer are equivalent concepts
LED bulb (42.9% vs 5%)
1000 watts
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