Cathodic Protection Tester Practice Exam

What is the function of voltmeters in low voltage ranges?

1. To measure high current

2. To provide inaccurate readings

3. To increase circuit resistance

4. To measure sensitive voltage variations

The correct answer is: To measure sensitive voltage variations

Voltmeters in low voltage ranges are specifically designed to measure small voltage differences with high accuracy. This capability makes them particularly valuable for detecting sensitive voltage variations that may occur in various electrical systems, including those involved in cathodic protection. Low voltage ranges allow the voltmeter to operate with increased sensitivity, making it capable of responding to small changes in voltage that could indicate issues such as corrosion or the effectiveness of protection measures. This fine measurement is crucial in applications where precise voltage readings are necessary to maintain system integrity and safety. The function of voltmeters aligns with the need to monitor subtle shifts in voltage, which can be instrumental in diagnosing electrical problems or assessing the performance of cathodic protection systems. For example, in a cathodic protection setup, small voltage changes can reflect differences in the effectiveness of protective measures against corrosion.