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.

  1. Step 1: The relationship between RMS voltage and peak voltage for a sinusoidal wave is .
  2. Step 2: Evaluate: .
Answer
.
Why not the others: divides peak voltage by 2; multiplies peak voltage by ; and is the peak value itself.

Practise more Electrostatics and Electromagnetism.

Free questions with an explanation for every one, and full timed CBSE Class 12 mock tests.