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calculation for Watts is = volts X amps

P=IE

P= Power(WATTS)

I = Current(AMPS) and

E = Voltage(VOLTS).

So: I = P/E and E = P/I therefore: 1 watt = 1 ampere x 1 volt

If you havea 240 volt lamp that is drawing .5 amp then it is using 120 Watts

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