Red Seal Electrician Practice
AC theoryQuestion 911 of 1506

An AC source heats a resistor exactly as much as a 10 V DC source across the same resistor. What is the AC value?

  1. 10 V peak
  2. 10 V average
  3. 10 V peak-to-peak
  4. 10 V RMS
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Correct answer: 10 V RMS

RMS is defined as the DC equivalent in heating effect.

Source: Lessons in Electric Circuits II: AC (Kuphaldt), 1.3: Measurements of AC Magnitude

Practice ac theory

Questions last reviewed: 18 October 2026