How is one watt defined in relation to joules?

One watt is defined as the power equivalent to one joule of energy used per second. This definition emphasizes the relationship between power and energy, demonstrating how quickly energy is transferred or converted. In practical terms, if a device operates at one watt, it is using one joule of energy every second during its operation.

Understanding this definition is crucial in fields such as electrical engineering and physics, where calculating energy consumption and making comparisons between different power ratings is essential. The other options represent different time intervals and do not accurately reflect the standard definition of a watt, which is firmly established in relation to the second as the unit of time. Thus, the correct answer connects immediate energy use with the fundamental concepts of power and energy.