USCG Exam PracticeAC circuits and theory
A series AC circuit contains a resistor, an inductor, and a capacitor. The inductive reactance equals the capacitive reactance at the operating frequency. Which statement best describes circuit behavior?
- A. Impedance is at its maximum and current is at its minimum
- B. Impedance equals zero and current is undefined
- ✓ Impedance drops to the value of the resistance alone and current is at its maximumCorrect
- D. The circuit behaves as a pure capacitor and current leads voltage by 90°
Why C is correct
NEETS Mod. 2 §4-1 states that at resonance in a series circuit, XL = XC, the reactive components cancel, impedance drops to just the resistance, and current is maximum. Maximum impedance and minimum current describe a parallel resonant circuit, not a series resonant circuit.
Cited:NEETS Mod. 2 §4-1