What is the magnitude of the impedance of a series RLC circuit at resonance?
High, compared to the circuit resistance
Approximately equal to capacitive reactance
Approximately equal to inductive reactance
Approximately equal to circuit resistance✓Correct answer
Explanation
At the resonant frequency the inductive and capacitive reactances of a series circuit are equal in magnitude and opposite in sign, so they cancel and leave only the resistance in the impedance. The result is a minimum impedance equal to the circuit resistance, not a high one.