Circuit resistance is usually measured off-line (de-energized) with an ohmmeter. In the absence of an ohmmeter, however, resistance may be INDIRECTLY measured on-line (energized) using what meter (or meters)?

Correct Answer: Option B — voltmeter and an ammeter

Applying Ohm's law ($R = V/I$), circuit resistance can be determined on an energized circuit by simultaneously measuring applied voltage with a voltmeter and current flow with an ammeter. This indirect method complies with standard electrical troubleshooting practices when de-energizing equipment is hazardous or impractical.