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コンセントの100Vとは、実効値が100Vで50Hzの正弦波。
電圧の最大値は100√2≒141Vで角周波数2π*50=100π rad/s
よって141sin100πt
実効値
https://ja.m.wikipedia.org/wiki/%E5%AE%9F%E5%8A%B9%E5%80%A4
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