Amateur Extra › E5 Electrical Principles › E5A03
E5A03
What is the magnitude of the impedance of a series RLC circuit at resonance?
Pick an answer to check it.
Answer: D. Approximately equal to circuit resistance
At resonance the inductive and capacitive reactances of a series circuit cancel. Only the resistance is left, so the impedance is about equal to the circuit resistance.
Tip: Series resonance: only R remains.