ARRL Technician Practice Exam

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Prepare for the ARRL Technician Exam. Access flashcards and multiple choice questions with detailed explanations. Get ready to become a certified amateur radio operator!

Each practice test/flash card set has 50 randomly selected questions from a bank of over 500. You'll get a new set of questions each time!

Practice this question and more.

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
Connect the probes in reverse order

The correct answer is: 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.