What does Ohm's Law express?

Ohm's Law expresses the relationship between voltage, current, and resistance in an electrical circuit. It is typically formulated as V = I × R, where V represents voltage, I denotes current, and R signifies resistance. This fundamental principle indicates that the voltage across a conductor is directly proportional to the current flowing through it, as long as the temperature and material properties remain constant.

Understanding this relationship is crucial for analyzing electrical circuits, as it allows one to determine how changes in resistance affect current and voltage. For example, if the resistance increases while the voltage remains constant, the current will decrease. This principle serves as a foundational concept in electrical engineering and physics, allowing professionals and students alike to predict how circuits behave under different conditions.

The other options communicate relationships that either encompass more variables than Ohm's Law addresses or pertain to concepts that are not included within the Ohm's Law framework. Therefore, recognizing Ohm's Law's exclusive focus on voltage, current, and resistance is essential for both theoretical comprehension and practical application in electrical systems.