General exam question G5A02
Subelement G5, ELECTRICAL PRINCIPLES· Group G5A
G5A02
What is reactance?
- A.Opposition to the flow of direct current caused by resistance
- B.Opposition to the flow of alternating current caused by capacitance or inductance (correct answer)
- C.Reinforcement of the flow of direct current caused by resistance
- D.Reinforcement of the flow of alternating current caused by capacitance or inductance
WhyReactance is opposition to the flow of alternating current caused by capacitance or inductance. Reactance is the opposition a capacitor or inductor presents specifically to alternating current, arising from the way these components store and release energy in step with a changing signal rather than from resistive heat loss, answer B. It's a phenomenon of AC, not DC, which rules out A and C, and it's still opposition, not reinforcement, of current flow, which rules out D.
Published 2026-08-28 · Last updated 2026-08-28 · Question text is verbatim from the 2023-2027 NCVEC Element 3 pool (public domain); the explanation above is original writing, see our methodology.
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