Nate Core Practice Test

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Prepare for the NATE Core Test with detailed questions and answers. Boost your confidence with comprehensive explanations, flashcards, and multiple-choice quizzes. Ensure your success on the exam day!

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What is the most important consideration when connecting an ohmmeter to an electrical circuit?

Power source should be connected
Using the highest range setting
Meter should be set to voltage
Power source must be disconnected

The correct answer is: Power source must be disconnected

The most important consideration when connecting an ohmmeter to an electrical circuit is that the power source must be disconnected. This is critical because ohmmeters are designed to measure resistance, and any voltage present in the circuit can lead to inaccurate readings and potentially damage the meter. When the power is on, the circuit is energized, and the current flowing through the components can cause misleading resistance measurements. Additionally, if the ohmmeter is connected to a live circuit, it can create a hazardous situation by introducing high voltages into the meter, potentially damaging it or causing safety risks to the user. Therefore, ensuring that the power source is completely disconnected before taking resistance measurements helps ensure both the accuracy of the readings and the safety of the equipment and the operator. This fundamental practice is essential for anyone working with electrical testing tools.