Watts are used to measure:

Watts are used to measure power, which is the rate at which energy is transferred or converted. In the context of electrical systems, power can be understood as the product of voltage and current, as described by the formula P = V x I, where P represents power (in watts), V represents voltage (in volts), and I represents current (in amperes). Power is a critical concept in understanding how much electrical energy is being used or generated in a system.

Each of the other terms relates to different electrical properties: voltage measures the electric potential difference, current measures the flow of electric charge, and resistance quantifies how much a component resists the flow of current. These concepts are all interrelated, but when specifically referring to the measurement of energy transfer rate in an electrical system, watts is the appropriate unit.