USCG Exam PracticeAC circuits and theory
The RMS value of an AC voltage is best described as which of the following?
- A. The maximum voltage reached during each half-cycle
- B. The average value of one complete cycle of the sine wave
- ✓ The DC equivalent value that produces the same heating effect in a resistanceCorrect
- D. 0.637 times the peak voltage
Why C is correct
NEETS Mod. 2 §1-2 defines RMS (effective) value as the DC value that would produce the same heating in a resistance, and states RMS = 0.707 × peak. Option A describes peak value. Option B is incorrect because the full-cycle average of a sine wave is zero. Option D describes the average value of one half-cycle, not the RMS value.
Cited:NEETS Mod. 2 §1-2