Which unit measures work or energy, equal to one newton moving one metre?

The unit that measures work or energy, defined as one newton moving one metre, is the joule. In physics, work is defined as the energy transferred when a force is applied over a distance. Specifically, if a force of one newton is exerted to move an object one metre in the direction of the force, the work done is exactly one joule.

This foundational understanding of work and energy is crucial since joules are commonly used in various contexts, including mechanical work, electrical energy, and thermal energy. The definition aligns directly with the formula for work, which is the product of force and distance. Other units, such as watts, calories, and volts, have different meanings and applications in physics. Watts measure power (the rate at which work is done), calories measure thermal energy, and volts measure electrical potential difference. Hence, the joule is the most appropriate unit for quantifying work and energy in this context.