Extra exam question E5D03
Subelement E5, ELECTRICAL PRINCIPLES· Group E5D
What is the phase relationship between current and voltage for reactive power?
- A.They are out of phase
- B.They are in phase
- C.They are 90 degrees out of phase (correct answer)
- D.They are 45 degrees out of phase
WhyReactive power involves current and voltage that are 90 degrees out of phase. Reactive power involves current and voltage that are 90 degrees out of phase with each other, the defining characteristic of power that's exchanged back and forth with a reactive component rather than actually consumed, answer C. They aren't simply "out of phase" in some unspecified way, aren't in phase (that would describe real power instead), and 45 degrees doesn't match the phase relationship reactive power is defined by.
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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