What is a common unit used to measure power?

Power is defined as the rate at which work is done or energy is transferred over time. The standard unit for measuring power in the International System of Units (SI) is the watt. One watt is equivalent to one joule per second, meaning that if one joule of energy is transferred or converted in one second, the power is one watt.

In practical terms, watts are commonly used to describe the power ratings of electrical devices, mechanical systems, and various forms of machinery, illustrating how much energy they consume or produce in a given amount of time. The watt is a crucial measurement in fields such as engineering, physics, and energy management.

The other units mentioned do not measure power: a joule measures energy, a newton measures force, and a pascal measures pressure. Each of these units serves important roles in their respective contexts but does not quantify power directly.