ARRL Technician Practice Exam 2025 - Free Technician License Practice Questions and Study Guide

Question: 1 / 470

Which of the following precautions should be taken when measuring circuit resistance with an ohmmeter?

Ensure that the circuit is powered

Use a high range setting

Ensure that the circuit is not powered

When measuring circuit resistance with an ohmmeter, it's essential to ensure that the circuit is not powered. This precaution is crucial because if the circuit is live, the voltage can produce misleading readings and even damage the ohmmeter. Additionally, applying power to the circuit while attempting to measure resistance could pose a safety hazard to the user and other components within the circuit.

By ensuring the circuit is de-energized, you allow the ohmmeter to accurately measure the resistance of the components without interference from any voltage sources. This approach also allows for a safer working environment, preventing the risk of electrical shock or equipment damage that could occur if the device is incorrectly used in a powered state.

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