Extra exam question E5A08
Subelement E5, ELECTRICAL PRINCIPLES· Group E5A
What is the phase relationship between the current through and the voltage across a series resonant circuit at resonance?
- A.The voltage leads the current by 90 degrees
- B.The current leads the voltage by 90 degrees
- C.The voltage and current are in phase (correct answer)
- D.The voltage and current are 180 degrees out of phase
WhyAt resonance, the voltage across and the current through a series resonant circuit are in phase. At resonance, a series RLC circuit's reactances cancel and its impedance becomes purely resistive, which means the voltage across the circuit and the current through it rise and fall together with no phase difference between them, answer C. Neither leads the other by 90 degrees, and they aren't 180 degrees apart either, that would describe a circuit dominated entirely by one reactive element with no resistance.
Published 2026-08-28 · Last updated 2026-08-28 · Question text is verbatim from the 2024-2028 NCVEC Element 4 pool (public domain); the explanation above is original writing, see our methodology.
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