Technician exam question T5A09
Subelement T5, ELECTRICAL PRINCIPLES· Group T5A
T5A09
Which of the following describes alternating current?
- A.Current that alternates between a positive direction and zero
- B.Current that alternates between a negative direction and zero
- C.Current that alternates between positive and negative directions (correct answer)
- D.All these answers are correct
WhyAlternating current is current that alternates between positive and negative directions. Alternating current periodically reverses direction, flowing positive, then negative, then positive again, answer C. A and B each describe current swinging between one direction and zero, closer to a pulsing DC waveform, and D is wrong because only C actually describes what AC does.
Published 2026-08-28 · Last updated 2026-08-28 · Question text is verbatim from the 2026-2030 NCVEC Element 2 pool (public domain); the explanation above is original writing, see our methodology.
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