What does Ohm's Law describe in electrical engineering?

Ohm's Law fundamentally describes the relationship between voltage, current, and resistance in an electrical circuit. The correct expression of this law is V = I × R, which means that the voltage (V) across a conductor between two points is directly proportional to the current (I) flowing through that conductor and the resistance (R) of the conductor. This relationship is foundational in electrical engineering, as it allows engineers and technicians to analyze and design circuits by predicting how changes in voltage or resistance will affect current flow.

This law applies under the condition that the material behaves in a linear and predictable way, which is typically the case for many conductors at constant temperature. By using this equation, one can rearrange it to solve for the other variables as needed — whether you need to find voltage, current, or resistance in various applications. Thus, the equation V = I × R serves as a cornerstone in understanding and utilizing electrical systems.

The other expressions relate to different concepts or implications of electrical systems but do not directly represent Ohm's Law. For example, while power relates to current and resistance through the equation given in one of the other choices, it does not define the foundational relationship described by Ohm's Law. Similarly, the equation involving time