Impedance
阻抗
While Ohm's Law applies directly to resistors in DC or in AC circuits, the form of the current-voltage relationship in AC circuits in general is modified to the form:
尽管欧姆定律直接适用于直流电路或交流电路中的电阻，但交流电路中电流-电压关系的形式通常会有所修改，形式为：
where I and V are the rms or "effective" values. The quantity Z is called impedance. For a pure resistor, Z = R. Because the phase affects the impedance and because the contributions of capacitors and inductors differ in phase from resistive components by 90 degrees, a process like vector addition (phasors) is used to develop expressions for impedance. More general is the complex impedance method.
其中I和V是均方根值或“有效值”。量Z称为阻抗。对于纯电阻，Z = R。由于相位影响阻抗，并且电容器和电感器的贡献与电阻元件在相位上相差90度，因此使用类似矢量加法（相量）的过程来发展阻抗的表达式。更一般的是复数阻抗方法。
| Series and parallel combination of any two impedances
任意两个阻抗的串联和并联组合 |
AC circuit concepts
AC电路概念索引
| HyperPhysics***** Electricity and Magnetism
HyperPhysics ***** 电学和磁学 | R Nave |
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