What does a watt measure?

A watt is defined as a unit of electrical power, which quantifies the rate at which electrical energy is transferred or converted. Specifically, one watt is equal to one volt-ampere, which is derived from the relationship of voltage (volts) multiplied by current (amperes). This relationship is key in electrical circuits, as it helps to determine how much power is being consumed or produced by an electrical device.

Understanding this measurement is crucial for electrical work because it allows technicians to assess power requirements, ensure devices operate within safe limits, and design electrical systems effectively. Each option represents a different electrical parameter; therefore, while they are relevant in electrical contexts, only the relationship between voltage and current directly describes power in terms of watts.