Electricity For HVACR Practice Test

When checking a fuse with an ohmmeter, what should be the reading of a good fuse?

Infinity ohms Zero ohms 10 ohms 100 ohms

Correct Answer:

Zero ohms

Explanation:

A good fuse should read zero ohms when checked with an ohmmeter. This indicates that the fuse provides a complete path for electrical current to flow without any interruption. When a fuse is functioning properly, it behaves like a short circuit, allowing electrical current to pass through effortlessly. If the fuse has blown or is faulty, the ohmmeter would register an infinite resistance, indicating that there is no continuity. Therefore, reading zero ohms confirms that the fuse is intact and capable of performing its protective role in the electrical circuit.

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