USCG Exam PracticeAC circuits and theory
What does the RMS value of an AC voltage represent?
- A. The peak voltage divided by 2
- ✓ The equivalent DC value that produces the same heating effect in a resistanceCorrect
- C. The average value of one complete cycle of the sine wave
- D. The voltage at a specific instant in the cycle
Why B is correct
NEETS Mod. 2 §1-2 defines RMS as the effective value — the DC equivalent that produces the same heating in a resistance. The full-cycle average of a sine wave is zero, and the instantaneous value describes only one moment; neither equals the RMS value.
Cited:NEETS Mod. 2 §1-2