What law is voltage?

Could you please clarify your question? Voltage, as a term, is not typically associated with law but rather with electrical engineering and physics. Voltage is a measure of the difference in electric potential between two points in an electric field, expressed in volts. It's a fundamental concept in electrical circuits and is used to describe the force that pushes electric charges through conductors. If you're asking about laws related to electricity or voltage specifically, there are several laws that govern electrical phenomena, such as Ohm's Law, Faraday's Law of Electromagnetic Induction, and Kirchhoff's Voltage Law. However, these are not legal laws but rather physical laws that describe the behavior of electrical systems. Could you please provide more context or clarify your question so I can give a more accurate answer?