Question

# An L-R-C series circuit consists of a $2.50-\mu F$ capacitor, a 5.00-mH inductor, and a $75.0-\Omega$ resistor connected across an ac source of voltage amplitude 15.0 V having variable frequency. (a) Under what circumstances is the average power delivered to the circuit equal to $\frac{1}{2} V_{\mathrm{rms}} I_{\mathrm{rms}}$ (b) Under the conditions of part (a), what is the average power delivered to each circuit element and what is the maximum current through the capacitor?

Solution

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The average power $P_{avg}$ is given by the following equation:

$$$P_{\mathrm{av}}=V I \cos \phi$$$

Where $\cos \phi$ is the power factor of the phase angle of voltage with respect to current.

We are given the average power in the problem by

$$$P_{\mathrm{av}}=\dfrac{1}{2}\left(V_{\mathrm{rms}} I_{\mathrm{rms}}\right)$$$

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