What is the magnitude of the impedance of a parallel RLC circuit at resonance?
Approximately equal to circuit resistance✓Правильный ответ
Approximately equal to inductive reactance
Low compared to the circuit resistance
High compared to the circuit resistance
Объяснение
In a parallel resonant circuit the inductive and capacitive branch currents are equal and opposite, so they cancel at the terminals and only the resistive branch draws current from the source. The impedance is therefore high compared with the reactances but is set by, and approximately equal to, the parallel resistance itself.