CR104B Vehicle Electrical And Mechanical Systems Practice Test

Which of the following is NOT a reason to disconnect power before measuring resistance?

To Prevent Damage To The Meter To Avoid Electrical Shock To Obtain An Accurate Measurement To Ensure The Circuit Remains Energized

Correct Answer:

To Ensure The Circuit Remains Energized

Explanation:

When you measure resistance, you want the reading to reflect only the component’s resistance, not any currents or voltages from a live circuit. The meter applies a small current through the part and measures the resulting voltage drop to calculate resistance. If power is on, other sources can drive current through the path, giving a distorted, meaningless reading and potentially stressing the meter’s input. Disconnecting power also reduces the risk of electrical shock and protects the meter from damage that can occur if live voltage is present on the measurement terminals. So keeping the circuit energized is not a valid reason for measuring resistance; it undermines accuracy and safety.

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