Gas Fitter Practice Test

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What is the role of an ohmmeter in electrical testing?

Measuring voltage
Measuring current
Measuring resistance
Measuring power

The correct answer is: Measuring resistance

The role of an ohmmeter in electrical testing is to measure resistance. An ohmmeter is specifically designed to have a known voltage and to measure the current that flows through a circuit when a resistance is introduced. By using Ohm's Law (V = I × R), the device can then calculate the resistance value based on the current that is measured and the voltage supplied. This function is particularly crucial in various applications, such as verifying whether electrical components are functioning correctly, testing continuity in circuits, and evaluating the condition of insulation. The ability to accurately measure resistance helps to ensure that electrical systems operate safely and effectively. Other devices like a voltmeter and ammeter are used to measure voltage and current, respectively, while a wattmeter measures power, differentiating them from the specific role of an ohmmeter.