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Power is joules per second, also known as watts. You can calculate watts if you know volts and amperes by simply multiplying them together, because volts is joules per coulomb and amperes is coulombs per second - multiplying them gives you joules per second. It gets a little complex when you start talking about AC power, because current and voltage is not always in phase, but the principle is the same.
AnswerThere is no such thing as 'electric' power. Power is not a 'thing', it's a rate: the rate of doing work, or of heat transfer, expressed (as explained above) in joules per second which has been given the special name, the watt.
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