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樓上:P=R*U還是P=I*R 應該是:P=I*U U=I*R 按以上公式應該是100w的亮,100w的燈泡兩端電壓大約是157v,40w的燈泡兩端電壓大約是63v.這只是我自己的看法也不知對不對,說的不對可以拍磚…
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