Gas Fitter Practice Test 2025 - Free Gas Fitter Practice Questions and Study Guide

Question: 1 / 455

What is the most important consideration when using an ohmmeter?

Zero the meter before using it

Ensure the battery is good

Power up the circuit prior to testing

De-energize the circuit

When using an ohmmeter, de-energizing the circuit is critical to ensure accurate and safe measurements. An ohmmeter is designed to measure resistance by sending a small current through the circuit or component being tested. If the circuit is energized, the presence of voltage can lead to misleading readings or damage the meter, causing it to malfunction. Additionally, applying voltage while trying to measure resistance can pose a serious safety risk, including electrical shock.

By de-energizing the circuit, you eliminate the risk of encountering live voltage, allowing the ohmmeter to function correctly and providing an accurate resistance value. This practice is essential for both safety and the integrity of the measurements taken.

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