Cathodic Protection Tester Practice Exam

Which law describes the relationship between voltage, current, and resistance?

1. Faraday's Law

2. Ohm's Law

3. Kirchhoff's Law

4. Laplace's Law

The correct answer is: Ohm's Law

The correct answer is the one that identifies Ohm's Law, which establishes a fundamental relationship in electrical circuits. Ohm's Law states that the current through a conductor between two points is directly proportional to the voltage across the two points and inversely proportional to the resistance of the conductor. Mathematically, it is expressed as I = V/R, where I represents current, V represents voltage, and R represents resistance. This relationship is crucial for understanding how electrical systems behave, particularly in the context of cathodic protection systems, which rely on controlling voltage and current to protect against corrosion. Ohm's Law is foundational for analyzing electrical circuits and for the practical application of cathodic protection techniques. Notably, it allows technicians to calculate how changes in voltage can affect current flow or how altering resistance can influence the overall system performance, which is essential in ensuring effective cathodic protection. The other laws mentioned serve different purposes; Faraday's Law pertains to electrolysis and the relationship of electric current to chemical reactions, Kirchhoff's Law deals with current and voltage in electrical circuits but does not define a direct relationship like Ohm's Law, and Laplace's Law relates to fluid dynamics rather than electrical concepts. Thus, the emphasis