Before measuring resistance with a volt-ohm meter, what should you ensure about the circuit?

Before measuring resistance with a volt-ohm meter, what should you ensure about the circuit?

• A. Measure with the component still connected in the circuit
• B. Remove the component from the circuit
• C. Power the circuit and measure
• D. Use a different meter

Answer: (B)

When using a volt-ohm meter, measure resistance after removing the component from the circuit so you’re reading only that component’s resistance. If the component stays connected, or the circuit is powered, the meter’s test current can flow through other components, parallel paths, or through charged capacitors, giving a reading that reflects the whole network rather than the single component. Isolating the component eliminates these extra paths and lets the meter determine the true resistance. Also ensure the circuit is de-energized and any capacitors are discharged for safety and accuracy.

When using a volt-ohm meter, measure resistance after removing the component from the circuit so you’re reading only that component’s resistance. If the component stays connected, or the circuit is powered, the meter’s test current can flow through other components, parallel paths, or through charged capacitors, giving a reading that reflects the whole network rather than the single component. Isolating the component eliminates these extra paths and lets the meter determine the true resistance. Also ensure the circuit is de-energized and any capacitors are discharged for safety and accuracy.