Question

#8 Finding the Phase Angle in a Series RLC Circuit An RLC circuit with a resistance of 120 is subject to an AC voltage with w chosen such that the inductive and capacitative reactance are equal in magnitude. What is the phase angle o? O A. O=0° OB. O = 45° O C. Ó= 90° O D. cannot be determined from the specified information #9 Operating at Resonance In #8, suppose the RMS Voltage is 120 V. What RMS curent flows in the series RLC circuit? Recall that VRMS IRMSZ. Hint: What is the impedance if one operates at resonance? OA. 1.00 A B. 2.00 A C. 3.00 A D. 4.00 A

Question 9 please.

Answer 1

At resonance inductive and capacitive effect cancels each other. So impedance is always equal to resistance at resonance.

$Z= R =120 \Omega$

Given that RMS voltage

Now RMS current is given as

$I_{RMS} = \frac{V_{RMS}}{R}$

$I_{RMS} = \frac{120 \ \ volt}{120 \Omega}$

Option A 1.00A is correct.

Thanks for asking.