41_power - Lesson 41: Power The word power is most often...

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Lesson 41: Power The word “ power ” is most often associated with electricity in everyday use, but this is not the case in physics. Power is the rate at which work is done. This means that power measures how quickly energy is being used. Since it is the rate at which something is happening, time must be involved somehow. If you look at the basic formula for power, you’ll see that it is the same as many formulas that involve time. P = W t = E t P = power (Watts) W = Δ E = work (Joules) t = time (seconds) Power is really how fast you are using up energy, so it could be measured in Joules per second. In honour of his search for a more efficient engine (which was better at converting energy!), the unit for power is called the Watt after James Watt . Think of a light bulb… you always talk about how many Watts the bulb is, like a 60 W bulb. That just means that the light bulb is using 60 Joules of energy every second. Example 1
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This note was uploaded on 12/02/2011 for the course PHYSICS 235 taught by Professor Staff during the Fall '08 term at Rutgers.

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41_power - Lesson 41: Power The word power is most often...

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