What characteristic indicates the status of a blown fuse when measuring voltage?

The characteristic that indicates the status of a blown fuse when measuring voltage is full voltage and zero current. When a fuse is intact, it completes the circuit, allowing current to flow. However, when a fuse blows, it breaks the circuit, and although the voltage across the terminals of the fuse may still be present (indicating that the supply voltage is full), there will be no current flowing through the circuit. This is because the open circuit created by the blown fuse prevents any current from passing through.

In a working circuit where the fuse is functioning, you would expect to see both voltage and current present. When the fuse is blown, you can measure the full voltage across the terminals but will find the current to be zero, which is critical for diagnosing electrical issues. This situation allows technicians to pinpoint the problem as a blown fuse effectively during troubleshooting.