Which unit is equivalent to one joule per second?

One joule per second is defined as one watt. The watt is the SI unit of power, and it represents the rate at which energy is transferred or converted. When you think about energy transfer, a watt quantifies how much energy (in joules) is utilized or produced in one second.

This clear relationship makes watts a fundamental unit in both electrical and mechanical systems, as it simplifies the understanding of how energy is consumed or generated over time. Understanding this conversion is essential for energy monitoring and efficiency practices, especially for utility marketing representatives who need to convey energy usage effectively to consumers.

In contrast, the other units listed have different definitions and applications. BTUs (British Thermal Units) measure heat energy, kW (kilowatts) is a larger unit of power equivalent to 1,000 watts, and therms are used for measuring the heat content in natural gas. While kW is related to watts, the specific correspondence of a joule per second directly corresponds to a watt, making it the most accurate answer to the question.