Question

In an $L-C-R$ circuit, at resonance

• A. the current and voltage are in phase
• B. the impedance is maximum
• C. the current is minimum
• D. the current leads the voltage by $\pi/2$

Answer 1

Answer: (A)

the current and voltage are in phase

Answer 2

Key concept Resonance occurs in a series
$L-C-R$ circuit, when $X_{L}=X_{C}$ or $\omega_{r}=\frac{1}{\sqrt{L C}}$.
In an $L-C-R$ circuit at resonance the current and voltage are in phase.