What principle describes the flow of electrons from high to low voltage?

The principle that describes the flow of electrons from high to low voltage is indeed best captured by Ohm's Law. Ohm's Law articulates the relationship between voltage (V), current (I), and resistance (R) within an electrical circuit, stating that current is directly proportional to voltage and inversely proportional to resistance. In practical terms, this means that when a potential difference (voltage) is applied, electrons will flow from a region of higher voltage to a region of lower voltage, providing the driving force for electrical current in a circuit.

Ohm's Law captures this behavior succinctly in the formula I = V/R, making it clear that the greater the voltage difference, the higher the current, provided that resistance remains constant. This principle is foundational in understanding how electrical circuits function and is crucial for analyzing electric circuits in both theoretical and practical applications.