Cathodic Protection Tester Practice Exam

What type of relationship does Ohm's Law illustrate?

1. Power to voltage

2. Voltage to resistance

3. Voltage to current and resistance

4. Resistance to energy

The correct answer is: Voltage to current and resistance

Ohm's Law illustrates the relationship between voltage, current, and resistance in an electrical circuit. It is mathematically expressed as V = IR, where V stands for voltage, I for current, and R for resistance. This formula indicates that the voltage across a conductor is directly proportional to the current flowing through it and the resistance of the conductor. Understanding this fundamental relationship is crucial in the field of electrical engineering and cathodic protection, as it helps technicians predict how changes in one variable (such as increasing resistance) will impact the other variables (like resulting voltage or current). This knowledge allows for better analysis and troubleshooting of electrical systems, ensuring effective cathodic protection measures are in place to prevent corrosion. While the other options touch on aspects related to electrical principles, they do not comprehensively encompass the complete relationship defined by Ohm's Law as accurately as the correct choice does.