Wiring and componentsQuestion 842 of 1506

What is meant by the breakdown voltage of an insulating material?

  1. The voltage at which it becomes magnetized
  2. The voltage it drops when carrying its rated current
  3. The highest voltage it can carry without heating
  4. The least voltage that makes it conduct
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Correct answer: The least voltage that makes it conduct

Breakdown voltage, also called dielectric strength, is the minimum voltage that frees electrons and forces current through the insulator.

Source: Lessons in Electric Circuits I: DC (Kuphaldt), 12.8: Insulator Breakdown Voltage

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Questions last reviewed: 18 October 2026