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假設交流電U(t)=Asint與直流電U(t)=B給電阻R的做功能力相同那麼就說B為交流電壓Asint的有效值.在0-2π的時間內交流電功率的積分∫(Asint)^2dt/R=πA^2/R而這段時間內直流電所做的功為2πB^2/R因此πA^2/R=2πB^2/R,A…
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