To test fuses in an energized circuit, what testing apparatus or meter should be used?

Correct Answer: Option A — voltmeter

A voltmeter measures the potential difference across the fuse. If the fuse is intact, the reading is zero volts due to negligible resistance. If the fuse is blown, the voltmeter will indicate the full circuit voltage across the open terminals, confirming the fuse has failed while the circuit remains energized.