Define Ohm's Law.

Ohm's Law is fundamentally a principle in electrical engineering that establishes a direct relationship between voltage, current, and resistance in a circuit. According to this law, the voltage in a circuit (V) is equal to the product of the current (I) flowing through the conductor and the resistance (R) of the conductor. This is mathematically expressed as V = I × R.

Understanding Ohm's Law is crucial for anyone working with electrical systems, as it allows for the calculation of how much voltage is needed to drive a certain amount of current through a resistance, or conversely, how much current will flow through a resistance given a certain voltage. This principle is foundational for analyzing and designing circuits, predicting circuit behavior, and troubleshooting electrical problems.

The other options refer to different concepts in electricity: the measurement of electrical power focuses more on the rate at which energy is consumed or produced; principles governing magnetic fields deal with magnetism and electromagnetic theory; and types of electrical loads pertain to devices that consume electrical power. None of these aspects are directly encapsulated by Ohm's Law, which is specifically centered on the relationship of voltage, current, and resistance.