Recreational Vehicle (RV) Technician Practice Test 2025 – All-in-One Guide to Master Your Certification!

Question: 1 / 400

What should be avoided when measuring resistance with a voltmeter?

Connecting the meter in series

Connecting the meter in parallel

Measuring in a powered circuit

When measuring resistance with a voltmeter, it is crucial to avoid measuring in a powered circuit. This is because a voltmeter is designed to measure voltage across components and is not intended to measure resistance while current is flowing through the circuit. If you attempt to measure resistance in a powered circuit, the current from the power source can produce erroneous readings due to the meter's internal resistance and can potentially damage the voltmeter itself.

In contrast, measuring resistance should always be done in an unpowered circuit. When resistance is measured correctly, the meter applies a small voltage and measures the resulting current to calculate the resistance using Ohm's law. This process relies on the absence of any external voltages, otherwise, the measurement will not be accurate and could lead to unsafe conditions or equipment damage.

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Using a faulty multimeter

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