1. The problem statement, all variables and given/known data The ac circuit has 3 components in series: a Capacitor C=120μF, an Inductor L=100mH, and a resistor R=7Ω. A) Find the amplitude of the voltage across the resistor R in the LCR circuit below, when operated at a frequency of 45 Hz? B) What is the phase difference between this voltage and the supply voltage, Vac (= (15 V)cosωt)? C) At what frequency is this phase difference zero? D)What is the Q value of this resonant circuit? 2. Relevant equations V(t)=Vocos(ωt + ∅) Z=Vo/Io=R (Z=impedance) ω=2πf Q=(ωo)(L)/R There the only relatable I can find 3. The attempt at a solution Attempt for part (A) Using V(t)=Vocos(ωt + ∅) I tried searching for Vo as that is the amplitude but we are not given any Voltage? Then I tried using Z=Vo/Io and I found the impedance but then I realised I don't have Io (current). So I was stuck plugging in numbers and trying to manipulate formulae to no avail. Attempt for part (B) Well I think the voltage amplitude here is 15V with no phase change as ∅ is not present. So I said there is no difference as they must be in phase if there doesn't exist a ∅. Not sure if that is right. Attempt for part (C) I used Q=(ωo)(L)/R, then I used the fact that ω=2πf which yielded an equation of the form Q=(2π)(f)(L)/R . I plugged in the figures and got a value of 4.04. Please help! I am very stuck.