text: what are the corresponding units for work, energy and power?   work units: joule, or n-m for mech work  the rate at which work is performed is power. power units: watts, or joule/sec  in physics, energy is said to be the ability to do work; the strict mathematical definition of energy in physics always being the amount of work itself (done by or against specified force). energy has the same units as work; a force applied through a distance. the si unit of energy, the joule, equals one newton applied through one meter, for example. energy has no direction in space, and is therefore considered a scalar quantity.