Universal Power Unit Forex watt kilowatt British HP Metric HP kg·m/s kcal/sec Thermal units/second feet·pounds/second Joules/second Newton meters/second The ratio of the work done by force F to the time taken to complete the work, that is, the work done by force F in unit time, is called power. Power calculation formula：p=w/t p=UI P=I^2 *R P=Fv P=U^2/R