HyperPhysics***** Electricity and MagnetismĬombining impedances has similarities to the combining of resistors, but the phase relationships make it practically necessary to use the complex impedance method for carrying out the operations. Series and parallel combination of any two impedances More general is the complex impedance method. 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. Where I and V are the rms or "effective" values. 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:
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