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並前往https://engineering.stackexchange.com/questions/1926/why-is-kva-not-the-same-as-kw

Why is kVA not the same as kW? - Engineering Stack Exchange

If voltage and current are both sinewaves, then watts=volt-amps×cos(ϕ), where ϕ is the phase angle between voltage and current. It's pretty easy ...

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