General exam question G5B08
Subelement G5, ELECTRICAL PRINCIPLES· Group G5B
G5B08
What is the peak-to-peak voltage of a sine wave with an RMS voltage of 120 volts?
- A.84.8 volts
- B.169.7 volts
- C.240.0 volts
- D.339.4 volts (correct answer)
WhyA sine wave with an RMS voltage of 120 volts has a peak-to-peak voltage of about 339.4 volts. Peak-to-peak voltage for a sine wave is RMS voltage times 2√2 (about 2.828), so 120 volts RMS times 2.828 comes out to about 339.4 volts peak-to-peak, answer D. The smaller values in A, B, and C correspond to other conversions (like RMS-to-peak alone) rather than the full peak-to-peak swing.
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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