Which unit would be used to express power?

Power is defined as the rate at which energy is transferred or converted. In electrical systems, power is calculated using the formula P = V × I, where P represents power in watts, V is voltage in volts, and I is the current in amperes. Therefore, the unit of power in the International System of Units (SI) is the watt.

Watts measure the amount of energy consumed or produced per unit of time and are a standard measure for electrical power, commonly used to describe the output of electrical devices and equipment. Understanding that watts quantify how much work or energy is being utilized helps in evaluating the efficiency and performance of electrical systems.

The other units—volts (measure of electrical potential), amperes (measure of electrical current), and ohms (measure of electrical resistance)—are fundamental to understanding electrical circuits, but they specifically describe different aspects of electrical behavior and do not indicate power directly. Therefore, watts are uniquely suited for expressing power in electrical contexts.