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**1. The problem statement, all variables and given/known data**

When the power factor of RLC circuit is equal to one, the frequency of the voltage source is 3 x 10^3 Hz. The rms value of the voltage source is 139 Volts and at a frequency of 3 x 10^3 Hz, the rms current in the circuit is 37.1 amps. If the inductive reactance at 3 x 10^3 Hz is 47 Ohms, what is the average power of the circuit in Watts at 0.78 times the resonant frequency of the circuit?

**2. Relevant equations**

Pav= Irms Vrms cos theta

Irms= I/ rad 2

Vrms= V/rad 2

**3. The attempt at a solution**

I have no idea where to begin. I keep going in circles. The only thing I know is cos theta=1.

Can someone please help me out with this one?