What state should the electrical circuit be in before performing a continuity check?

What state should the electrical circuit be in before performing a continuity check?

• A. Power off
• B. Power on
• C. Power fluctuating
• D. Unknown state

Answer: (B)

Continuity is about whether there is a complete path for current to flow. To verify that a circuit will actually conduct as it does in operation, you test it with power applied so the entire path—including the source, conductors, switches, relays, fuses, and loads—participates in the circuit. This live check confirms that there are no open contacts or faulty connections that only show up when the circuit is energized. It’s about real-world functionality, not just the static resistance you’d measure with power removed. Use equipment and procedures rated for live testing, since a standard ohmmeter or improper method can cause damage or pose a safety hazard.

Continuity is about whether there is a complete path for current to flow. To verify that a circuit will actually conduct as it does in operation, you test it with power applied so the entire path—including the source, conductors, switches, relays, fuses, and loads—participates in the circuit. This live check confirms that there are no open contacts or faulty connections that only show up when the circuit is energized. It’s about real-world functionality, not just the static resistance you’d measure with power removed. Use equipment and procedures rated for live testing, since a standard ohmmeter or improper method can cause damage or pose a safety hazard.