The peak voltage of an alternating household power supply is . What is the root-mean-square (RMS) voltage of this AC supply?
Answer and explanation
Correct answer: C.
- Step 1: The relationship between RMS voltage and peak voltage for a sinusoidal wave is .
- Step 2: Evaluate: .
Answer
.
Why not the others: divides peak voltage by 2; multiplies peak voltage by ; and is the peak value itself.
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