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作为一个技术高手告诉你们90%的人包括电工都不知道的电知识 |
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不比流水长，只比黄花瘦。
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你这么吊，为什么还没有女朋友
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胸大威武
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 不愿独身飞九天，但求有伴闯人间。 孤枕难眠秋日烈，双侣同行春风绵。 憔首刹回伊已去，忠心永固路未偏。 恐心欲泯痴情路，只羡鸳鸯不羡仙。 |
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It's the best day of times,it's the worst day of times;
it was the age of wisdom,it was the age of foolishness; it was the epoch of belief,it was the epoch of incredulity; it was the season of light,it was the season of darkness; it was the spring of hope,it was the winter of despair; we had everything before us,we had nothing before us; we were all going direct to Heaven,we were all going direct the other way. |
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不愿独身飞九天，但求有伴闯人间。 孤枕难眠秋日烈，双侣同行春风绵。 憔首刹回伊已去，忠心永固路未偏。 恐心欲泯痴情路，只羡鸳鸯不羡仙。 |
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发表于 2013-6-11 11:45
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其实楼主说的热等效电压就是交流电压的有效值
其实就是一个周期内流过导体横截面积的电荷量为0，因为正弦交流电一个周期内电流方向变化两次
其实就是因为交流电电流方向会改变，电容器处于不断充放电，形成充放电电流而已
发表于 2013-6-11 14:43
