What is the phase relationship between the current through and the voltage across a series resonant circuit at resonance?
The voltage leads the current by 90 degrees
The current leads the voltage by 90 degrees
The voltage and current are in phase✓پاسخ درست
The voltage and current are 180 degrees out of phase
توضیح
At resonance the equal inductive and capacitive reactances cancel and the series circuit looks purely resistive. A purely resistive impedance has a phase angle of zero, so current and voltage are in phase.