Cathodic Protection Tester Practice Exam

What is Ohm's Law used to describe?

1. The relationship between voltage, current, and resistance

2. The connection between power and energy

3. The behavior of alternating currents

4. The flow of electromagnetic waves

The correct answer is: The relationship between voltage, current, and resistance

Ohm's Law is a fundamental principle in electrical engineering that describes the relationship between voltage, current, and resistance in an electrical circuit. It states that the current (I) flowing through a conductor between two points is directly proportional to the voltage (V) across the two points and inversely proportional to the resistance (R) of the conductor. The mathematical form of Ohm's Law is expressed as V = I × R. This relationship is crucial for understanding how electrical circuits operate, allowing practitioners to calculate one variable when the others are known. This is particularly important in cathodic protection systems, where maintaining the correct voltage and current is essential for preventing corrosion and ensuring the safety and longevity of pipelines and structures. The other options pertain to different concepts in electrical and electromagnetic theory. The connection between power and energy is more concerned with the formula P = V × I, the behavior of alternating currents involves different principles like impedance and reactance, and the flow of electromagnetic waves relates to Maxwell's equations rather than Ohm's Law. Each of those areas is important in its own right but does not pertain to the specific relationship detailed in Ohm's Law.