Final answer:
The term describing the condition where capacitive reactance equals inductive reactance is resonance, leading to maximum current in an AC circuit.
Step-by-step explanation:
The term that describes the condition in which capacitive reactance equals inductive reactance is resonance. At the resonant frequency, an AC circuit will exhibit this phenomenon, where the average power versus angular frequency plot peaks. At this point, because the inductive and capacitive reactances are equal and opposite, they cancel out, and the impedance of the circuit is equal only to its resistance. This is a unique condition in RLC circuits that leads to maximum current flow, and it's where the sharpness or width of the resonance peak is known as bandwidth and related to the quality factor.