Red Seal Electrician Practice
AC theoryQuestion 916 of 1506

Which AC measurement is the most useful for judging whether a conductor will overheat?

  1. Peak voltage
  2. Peak-to-peak voltage
  3. RMS current
  4. Average voltage
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Correct answer: RMS current

Heating depends on power dissipated, and RMS value gives the equivalent 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