What is the unit of electrical resistance defined as volts per ampere?

The unit of electrical resistance defined as volts per ampere is the ohm. According to Ohm's Law, the relationship between voltage (in volts), current (in amperes), and resistance (in ohms) is expressed as V = I × R. This means that the resistance can be obtained by rearranging the formula to R = V/I, demonstrating that one ohm is equivalent to one volt per ampere.

Ohms are a fundamental unit in the International System of Units (SI) and serve as the standard measurement for resistance in electrical circuits. Understanding this relationship is crucial for analyzing circuit behavior, as resistance affects how much current will flow in response to a given voltage. Other options like henrys, watts, and joules relate to different physical quantities: henrys measure inductance, watts measure power, and joules measure energy. Each of these units serves a distinct purpose in electrical and physical applications, but only ohms specifically quantify electrical resistance in the context of voltage and current.