Discussion
For an RLC series circuit, current at series resonance is __________.
Answer: B
At series resonance the current is maximum at unity power factor.
At the resonant frequency the inductive reactance equals the capacitive reactance, so they cancel. The impedance of the series circuit falls to its minimum value, the resistance R alone, and the current V/R is the largest the circuit can draw. Since the impedance is purely resistive, the current is in phase with the voltage and the power factor is unity.
Below resonance the circuit is capacitive (leading power factor) and above it inductive (lagging), and in both cases the current is less than at resonance. 'Minimum at unity power factor' describes the line current of a parallel resonant circuit, not a series one.
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