Ohm's law relates which of the following?

Ohm's law is a fundamental principle in electrical engineering that defines the relationship between voltage, current, and resistance in an electrical circuit. According to Ohm's law, the voltage across a conductor is directly proportional to the current flowing through it, provided the temperature remains constant. This relationship can be mathematically expressed with the equation V = I * R, where V represents voltage, I represents current, and R represents resistance.

Choosing the correct answer highlights the essence of this relationship: voltage (the electric potential difference), current (the flow of electric charge), and resistance (the opposition to the flow of current). Understanding this relationship is essential for analyzing and designing electrical systems, particularly in the context of cathodic protection systems where the manipulation of current is critical for corrosion prevention.

The other options refer to concepts that are related to electrical engineering but do not accurately reflect the direct relationship defined by Ohm's law. For example, resistance, power, and current, while interconnected in various contexts, do not form the basic equation described by Ohm’s law.