Meters and troubleshootingQuestion 301 of 1506

A fuse is measured with an ohmmeter on a de-energized circuit and reads OL. What does this show?

  1. The fuse is good
  2. The load is shorted
  3. The supply is off
  4. The fuse is blown
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Correct answer: The fuse is blown

A good protective device has very low resistance. Infinite resistance means it is open.

Source: Troubleshooting Motors and Controls (Dickson-Self), 1.2: Electrical Fundamentals

Practice meters and troubleshooting

Questions last reviewed: 18 October 2026