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smorrison@xxxxxxxxxxxxxxxxxxx wrote:
watts = volts * amps

That's true for DC, but it gets more complicated for AC, which has non-unity power factors involved (which vary according to how much of the load impedance is true resistance, and how much of it is reactance). Which is why lots of AC-powered equipment, and all has a Volt-Amp rating instead of (or in addition to) the Watt rating. It's also why a UPS typically has a VA rating rather than a W rating.

--
JHHL

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