Online Conversion Conversion Factors Useful Links Tell a Friend Contact

# Power

 unit name symbol SI equiv. joule per second J/s 1 J/s watt W 1 J/s iwattSI base unit of powerIn mechanical terms, one watt equals about 0.001 341 02 horsepower (hp) or 0.737 562 foot-pound per second (lbf/s). In electrical terms, one watt is the power produced by a current of one ampere flowing through an electric potential of one volt. kilowatt kW 1e+03 J/s megawatt MW 1e+06 J/s kilojoule per hour kJ/hr 2.77778e-01 J/s kilogram force meter per second kgf • m/s 9.80665 J/s calorie per second cal/s 4.1868 J/s calorie per hour cal/hr 1.163e-03 J/s British thermal units per second BTU/s 1.05506e+03 J/s British thermal units per hour BTU/hr 2.93072e-01 J/s tons Ton (RT) 3.51687e+03 J/s itonsUnit of power used in refrigeration engineering. One ton of refrigeration is intended to be the power required to freeze one short ton of water at 0?C in 24 hours. This is assumed to be exactly 12 000 Btu per hour metric horse power pk (Metric hp) 7.35499e+02 J/s imetric horse powerUnit of power, defined to be the power required to raise a mass of 75 kilograms at a velocity of 1 meter per second. This is approximately 735.499 watts or 0.986 32 horsepower horse power hp 7.457e+02 J/s ihorse powerUnit of power representing the power exerted by a horse in pulling electric horse power ehp 7.46e+02 J/s ielectric horse powerUnit of power, equal to exactly 746 watts (550.221 foot pounds per second) boiler horse power bhp 9.8095e+03 J/s iboiler horse powerThe boiler horsepower is defined to be the power required to convert 30 pounds (13.61 kilograms) per hour of water at 100 ?F (37.78 ?C) to saturated steam at a pressure of 70 pounds per square inch gauge (482.6 kilopascals gauge). This power, about 33 471 Btu per hour or 9.8095 kilowatts pound force foot per second lbf • ft/s 1.35582 J/s ipound force foot per second1 hose power = exactly 550 lbf • ft/s