Which unit represents power?

Power is defined as the rate at which work is done or energy is transferred over time. The unit of power is the watt, which is defined as one joule per second. This means that when an amount of work measured in joules is done in one second, the power exerted is one watt.

To provide context about the other units mentioned: joules measure energy or work, newtons measure force, and pascals measure pressure. Each of these units pertains to different physical concepts, while watts specifically quantify the rate of energy transfer, making it the correct choice for power. Understanding this distinction is crucial in mechanics, as it relates to how effectively energy is used or transferred in physical systems.