Rhode Island Electrical License Practice Test 2026 - Free Electrical License Practice Questions and Study Guide

When testing a load center with the main disconnect open and using an ohmmeter, if the ohmmeter shows any resistance at all, this indicates that there is a path for current to flow, which suggests that the circuit is intact and not open. This resistance can also mean that the fuse in the circuit is functioning properly, as it is allowing some measurable resistance, which is a characteristic of a good fuse. A good fuse typically has low resistance in the normal operating condition.

If the circuit were truly open, there would be infinite resistance indicated on the ohmmeter. Thus, the presence of any measurable resistance in this scenario leads to the conclusion that the fuse is good.