Cathodic Protection Tester Practice Exam

Which device is utilized to measure voltage levels in electrical circuits?

1. Oscilloscope

2. Ammeter

3. Voltmeter

4. Ohmmeter

The correct answer is: Voltmeter

The correct answer is the device specifically designed for measuring voltage levels in electrical circuits, which is the voltmeter. A voltmeter operates by being connected across two points in a circuit and providing a direct reading of the potential difference (voltage) between those points. This measurement is crucial for various applications in electrical engineering and troubleshooting, as it allows technicians to assess whether circuits are functioning as intended and to diagnose issues related to voltage supply. While an oscilloscope can also display voltage levels, it does so by visualizing voltage as a waveform over time, which is more complex than the straightforward measurement provided by a voltmeter. An ammeter, on the other hand, is designed to measure current rather than voltage, while an ohmmeter measures resistance. Each of these devices serves different purposes in the electrical field, but for the specific task of measuring voltage, the voltmeter is the appropriate choice.