| | | | | 可以推导的,纯电阻是R+j0,纯电感是0+jwL,纯电容是0+1/jwc;所以电阻是同相位,电感超前90度,电容滞后90度;
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| | | | | | | 写出复函数关系式,角度用反正切计算。即可得出相位关系。 |
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| | | | | 文内已经提到了,比如电容,电流和电压的关系是 i = C*dv/dt ,v=sin(ωt) , i = C*ω*cos(ωt) = C*ω*sin(ωt+90) ,即 i 领先v 90度。
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| | | | | 1 看不懂就不要看了,好像是外星人写的。还有什么负超前简直胡言乱语。2 不用看公式,想想电容两端电压不能突变,电感电流不能突变就比较容易理解了。
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| | | | | | | | | | | | | 大师变化够快。
问为什么不能突变问得我好尴尬,这事小学或初中的物理知识。
If the voltage changes instantly from one value to another (i.e. discontinuously), the derivative is not finite. This implies that an infinite current would be required to instantly change the voltage. Since an infinite current is not physically realizable, that means that the voltage cannot change instantaneously
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| | | | | | | | | 记着这个英文字 : civil (解民间的....) , C 呢,i在v之前, L呢,i在v之后 。
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