Red Seal Electrician Practice
AC theoryQuestion 935 of 1506

What is a main difference between reactance and resistance?

  1. Reactance dissipates heat and causes no phase shift
  2. Reactance is measured in henries
  3. Reactance gives a phase shift and no power loss
  4. Reactance does not depend on frequency
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Correct answer: Reactance gives a phase shift and no power loss

Reactance is measured in ohms, but it stores and returns energy instead of turning it into heat.

Source: Lessons in Electric Circuits II: AC (Kuphaldt), 3.2: AC Inductor Circuits

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Questions last reviewed: 18 October 2026