text: Work units: Joule, or N-m for mech work\n\nThe rate at which work is performed is power.\nPower units: watts, or Joule/sec\n\nIn 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).\nEnergy 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.