Power Converters

Power is the rate at which energy is transferred or work is done — energy per unit time. The SI unit is the watt (W), equal to one joule per second. Power spans an enormous range: a human at rest radiates about 80 W; a household kettle draws 2,000 W (2 kW); a wind turbine generates 2–5 MW; a large nuclear power station outputs around 1 GW; and the total global human power consumption is roughly 18 TW. Electrical power uses watts and kilowatts; automotive engineers use horsepower; HVAC engineers rate equipment in BTU/hour or tons of refrigeration; and thermodynamicists use caloric power units. Despite this variety, all are expressions of joules per second.

SI Units

SI Derived Units

British Thermal Unit Based Units

Caloric Energy Units

Calories (th)/second (cal(th)/s)

Calories (th)/minute (cal(th)/min)

Calories (th)/hour (cal(th)/h)

Kilocalories (th)/minute (kcal/min)

Kilocalories (th)/hour (kcal/h)

Mechanical Power Units

Foot pounds-force second (ft·lbf/s)

Foot pounds-force minute (ft·lbf/min)

Kilogram-force meters/minute (kgf·m/min)

Kilogram-force meters/hour (kgf·m/h)

Horsepower Variants Units

Horsepower (Electric) (hp)

Horsepower (International) (hp)

Special Units

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