Alternating Current Circuits AC Sources : angular frequency of AC voltage V max : the maximum output voltage of AC source Resistors in an AC Circuit i R : the instantaneous current in the resister v R : the instantaneous voltage across the resister Resistors in an AC Circuit I max : the maximum current v R : the instantaneous voltage across the resister Resistors in an AC Circuit rms : root mean square P av : the average power delivered to a resistor Inductors in an AC Circuit L : the inductance of the inductor v L : the self-induced instantaneous voltage across the inductor Inductors in an AC Circuit i L : the instantaneous current in the inductor Inductors in an AC Circuit the inductive reactance Inductors in an AC Circuit Capacitors in an AC Circuit C : the capacitance of the capacitor v C : the instantaneous voltage across the capacitor Capacitors in an AC Circuit the capacitive reactance Capacitors in an AC Circuit The RLC Series Circuit the impedance The RLC Series Circuit Power in an AC Circuit = 0 : P av in the resistor = /2: P av in the capacitor or inductor