The capacitive reactance, the inductive reactance, and the resistance of the circuit can be combined to give the impedance ZZ of the circuit. The impedance is a measure of the total reactance and resistance of the circuit and is similar to the equivalent resistance that can be found from various resistors in a dc circuit. Because vLvL and vCvC do not reach maximum values at the same time as ii$,$ the impedance is not found by adding RR$,$ XLXL$,$ and XCXC$.$ Instead, the impedance is found using

Z$=$R$2+($XL$$XC$)2$Z$=$R$2+($XL$$XC$)2.$

The analogy to Ohm's law is then