Definition that contains do work
- energy (physics) a thermodynamic quantity equivalent to the capacity of a physical system to do work; the units of energy are joules or ergs
- waterpower the power to do work that is latent in a head of water
- perpetual motion machine a machine that can continue to do work indefinitely without drawing energy from some external source; impossible under the law of conservation of energy
- free energy (physics) a thermodynamic quantity equivalent to the capacity of a physical system to do work; the units of energy are joules or ergs
- heat engine any engine that makes use of heat to do work
- low-powered having little power to do work