Question

An $LCR$ series circuit is at resonance. Then

• A. the phase difference between current and voltage is ${{90}^{o}}$
• B. the phase difference between current and voltage is ${{45}^{o}}$
• C. its impedance is purely resistive
• D. its impedance is zero

Answer 1

Answer: (C)

its impedance is purely resistive

Answer 2

An L-C-R series circuit is at resonance. Then its impedance $znin=R$ .