What is the resistance reading across a good fuse?

The resistance reading across a good fuse is considered to be 0 Ohms. This indicates that a properly functioning fuse acts as a closed circuit, allowing current to flow without restriction. In practical terms, a good fuse will not impede electrical current at all; hence, it should show virtually no resistance when measured with a multimeter.

A reading of 0 Ohms confirms that there is no break or fault within the fuse itself. If any measurable resistance were present, it would suggest an issue with the fuse, such as being partially blown or deteriorated, which would compromise its ability to perform its protective function. Therefore, when testing fuses, a reading close to zero helps ensure that the electrical circuit remains intact and protected from overload or faults.