Associated Locksmiths of America (ALOA) Practice Test 2025 – Your Comprehensive All-in-One Guide to Exam Excellence!

Question: 1 / 400

What precaution should be taken when checking resistance in a loop?

Ensure all devices are powered on

Check connections for loose wires

Shut off the power before measuring

When checking resistance in a loop, shutting off the power before measuring is crucial to ensure safety and accuracy. Measuring resistance requires a multimeter to send a small amount of current through the circuit to determine the resistance. If the power remains on during this process, it could pose a risk of electric shock to the technician and may damage the multimeter or the circuit being tested.

Additionally, the presence of voltage can lead to misleading readings; the multimeter may show erroneous values due to the interference from the powered components. By turning off the power, you not only protect yourself and your equipment but also ensure that the measurement reflects the true resistance of the components without any external influence.

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