Red Seal Electrician Practice
Meters and troubleshootingQuestion 622 of 1506

An electrician needs to check a circuit for hazardous voltage with a multimeter. Which meter modes must be used?

  1. AC volts only, because power systems use AC
  2. Both AC volts and DC volts, even if only one is expected
  3. DC volts only, because DC is more dangerous
  4. Resistance first, then AC volts
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Correct answer: Both AC volts and DC volts, even if only one is expected

A multimeter does not show DC when set for AC, or the reverse, and both can be deadly.

Source: Lessons in Electric Circuits I: DC (Kuphaldt), 3.9: Safe Meter Usage

Practice meters and troubleshooting

Questions last reviewed: 18 October 2026