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
• E. the current is minimum

Answer 1

Answer: (C)

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