A series LCR circuit is adjusted to resonance and connected to a constant-voltage a.c
PHYSICS · Single correct · A Level · Physics · Fields and their consequences · Fields and their consequences
Problem
A series LCR circuit is adjusted to resonance and connected to a constant-voltage a.c. source. Which of the following correctly explains why the average power consumed is maximum at resonance?
(a) The impedance becomes infinite at resonance.
(b) The phase difference between current and voltage becomes 90∘ at resonance.
(c) The power factor becomes 1 at resonance.
(d) The circuit current becomes zero at resonance.