At the resonant frequency of a series RLC circuit

PHYSICS · Single correct · A Level · Physics · Fields and their consequences · Fields and their consequences

Problem

At the resonant frequency of a series RLC circuit, the power factor (cos

\phi

) is (a) unity because the impedance is purely reactive. (b) less than unity (

R/Z

) because only the resistor consumes power. (c) unity because the voltage and current are in phase. (d) zero because the current leads the voltage by

90^{\circ}