A series RLC AC circuit is at resonance.It contains a resistor of 23 Ω,a capacitor of 0.25 μF and an inductor of 119 mH.If an effective (rms)voltage of 177 V is applied,what is the effective (rms)current when the circuit is in resonance?
A) 4.2 A
B) 7.7 A
C) 14 A
D) 2.6 A
E) 28 A

Question

A series RLC AC circuit is at resonance.It contains a resistor of 23 Ω,a capacitor of 0.25 μF and an inductor of 119 mH.If an effective (rms)voltage of 177 V is applied,what is the effective (rms)current when the circuit is in resonance?
A) 4.2 A
B) 7.7 A
C) 14 A
D) 2.6 A
E) ​28 A

Quizplus · Accepted Answer

At resonance, the impedance of the circuit is purely resistive and equals the resistance. Therefore, the effective (rms) current is calculated using Ohm's Law: I = V/R = 177 V / 23 Ω = 7.7 A.

A Series RLC AC Circuit Is at Resonance