In locating a low-power fault within a circuit, which multimeter setting is recommended?

In locating a low-power fault within a circuit, which multimeter setting is recommended?

• A. Set multimeter to resistance function
• B. Set multimeter to voltage function
• C. Set multimeter to capacitance function
• D. Set multimeter to continuity

Answer: (B)

When locating a low-power fault in a powered circuit, you want to see how the circuit is actually operating by checking voltages at different points. Using the voltage function on the multimeter lets you measure the real potential at those nodes while the circuit is energized, so you can spot where the voltage drops or is missing. This approach guides you to the faulty area without injecting additional current or altering the circuit, which would happen if you used resistance or continuity on a live line. Capacitance isn’t helpful for tracing a steady fault in a live DC circuit, since it measures stored charge in capacitors rather than normal operating levels. In practice, compare the measured voltages to the expected values at each point; deviations point you to the fault location.

When locating a low-power fault in a powered circuit, you want to see how the circuit is actually operating by checking voltages at different points. Using the voltage function on the multimeter lets you measure the real potential at those nodes while the circuit is energized, so you can spot where the voltage drops or is missing. This approach guides you to the faulty area without injecting additional current or altering the circuit, which would happen if you used resistance or continuity on a live line. Capacitance isn’t helpful for tracing a steady fault in a live DC circuit, since it measures stored charge in capacitors rather than normal operating levels. In practice, compare the measured voltages to the expected values at each point; deviations point you to the fault location.