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Metric System 1 Watt^{1} = 1 Joule per second

English 1 Horsepower^{2} (hp) = 746 Watts = 2545 BTU's^{3} per hour 1 Horsepower (hp) = 550 Foot-pounds^{4} per second

Work foot-pound: 1-lb force acting through a distance of 1 ft erg: a 1-dyne^{5} force through 1 cm joule: 1-newton^{6} force through 1 m

1 foot-pound = 1.356 joules 1 erg = 10^{-7} joules

^{1} The SI (Systme International) unit of electrical work is the watt. It represents the generation or use of electrical energy at the rate of 1 joule per second. The kilowatt is equal to 1000 watts.

^{2} One horsepower was originally defined as the amount of power required to lift 33,000 pounds 1 foot in 1 minute, or 550 foot-pounds per second.

^{3} One British Thermal Unit (Btu or BTU) was originally defined as the quantity of heat required to raise the temperature of 1 lb (0.45 kg) of water from 59.5 F (15.3 C) to 60.5 F (15.8 C) at constant pressure of 1 atmosphere. For accuracy, the BTU has now been defined in terms of the joule. One BTU is equal to 1055 joules. A BTU is equivalent to approximately 0.293 watt-hour.

^{4} In English system of units, the unit of work is the foot-pound (ft-lb), which is equal to the amount of work required to raise a mass of 1 lb through an elevation of 1 ft at sea level and 45 latitude.

^{5} A dyne is a centimeter-gram-second unit of force, equal to the force required to impart an acceleration of one centimeter per second per second to a mass of one gram.

^{6} A newton is a meter-kilogram-second system, the unit of force required to accelerate a mass of one kilogram one meter per second per second, equal to 100,000 dynes.

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