A 120V rms potential at f=1000Hz is applied to a 30 mH inductor, a 40 microF capacitor and a resistor (R). Irms=400mA. What is the value of R?
What is the power factor phase angle phi?
The only equation I know that I could possibly use to find R is Vrms=IrmsR, when I plugged in my data, I got R=300 ohms.
Using R=300 ohms, I rearranged the equation PF = cos phi = R/Z, where Z=sqrt(R^2+[XL-Xc]^2) to solve for R and I got phi=90 degrees. Which makes me suspicious.
The data never specified that the circuit was in resonance, so was my original equation invalid?

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@radar

I'm not sure what you are saying. Is my equation wrong?

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