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本文用代数方法通过热效应相等证明了正弦式交流电电流与电压的有效值为U=Um/2~(1/2),I=Im/2~(1/2)。
In this paper, we prove that the effective value of the sinusoidal AC current and voltage is U = Um / 2 ~ (1/2), I = Im / 2 ~ (1/2) through the equalization of thermal effect.