How Many Volts Should a Fuse Read in a Live Circuit?

Learn the correct voltage reading across a fuse in a live circuit and how to test fuse continuity effectively.

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A fuse should read 0 volts across it when installed in a live circuit and functioning properly. This indicates that the fuse is intact and there is no significant voltage drop across it. If the fuse is out of the circuit, a continuity test is more appropriate to ensure it is not blown.

FAQs & Answers

  1. What voltage should a good fuse show when tested in a live circuit? A good fuse should show 0 volts across it in a live circuit, indicating no voltage drop and that the fuse is intact.
  2. How can I test if a fuse is blown using a multimeter? To test a fuse with a multimeter, perform a continuity test with the fuse removed from the circuit; an intact fuse will show continuity.
  3. Why is there zero voltage across a functioning fuse in a live circuit? There is zero voltage because the fuse is not restricting current flow, so no voltage drop occurs across it.

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