General exam question G5B09
Subelement G5, ELECTRICAL PRINCIPLES· Group G5B
G5B09
What is the RMS voltage of a sine wave with a value of 17 volts peak?
- A.8.5 volts
- B.12 volts (correct answer)
- C.24 volts
- D.34 volts
WhyA sine wave with a value of 17 volts peak has an RMS voltage of about 12 volts. RMS voltage for a sine wave is the peak voltage divided by √2 (about 1.414), so 17 volts peak divided by 1.414 comes out to about 12 volts RMS, answer B. The other values don't match that standard peak-to-RMS conversion for a sine wave.
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.
Related questions
- G5B01What dB change represents a factor of two increase or decrease in power?
- G5B02How does the total current relate to the individual currents in a circuit of parallel resistors?
- G5B03How many watts of electrical power are consumed if 400 VDC is supplied to an 800-ohm load?
- G5B04How many watts of electrical power are consumed by a 12 VDC light bulb that draws 0.2 amperes?
- G5B05How many watts are consumed when a current of 7.0 milliamperes flows through a 1,250-ohm resistance?