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The dimension of power is energy divided by time. In the International System of Units (SI), the unit of power is the watt (W), which is equal to one joule per second. Other common and traditional measures are horsepower (hp), comparing to the power of a horse; one mechanical horsepower equals about 745.7 watts.
1 terawatt hour per year = 1 × 10 12 W·h / (365 days × 24 hours per day) ≈ 114 million watts, equivalent to approximately 114 megawatts of constant power output. The watt-second is a unit of energy, equal to the joule. One kilowatt hour is 3,600,000 watt seconds.
1 foot pound-force per second is equivalent to: 1.3558179483314 watts; 1.8 18 × 10 −3 horsepower; Related conversions: 1 watt ≈ 44.253 728 96 ft⋅lbf/min = 0.737 562 149 333 ft⋅lbf/s; 1 horsepower (mechanical) = 33,000 ft⋅lbf/min = 550 ft⋅lbf/s
The calorie is defined as the amount of thermal energy necessary to raise the temperature of one gram of water by 1 Celsius degree, from a temperature of 14.5 °C, at a pressure of 1 atm. For thermochemistry a calorie of 4.184 J is used, but other calories have also been defined, such as the International Steam Table calorie of 4.1868 J.
The rate of heat flow is the amount of heat that is transferred per unit of time in some material, usually measured in watts (joules per second). Heat is the flow of thermal energy driven by thermal non-equilibrium, so the term 'heat flow' is a redundancy (i.e. a pleonasm). Heat must not be confused with stored thermal energy, and moving a hot ...
The work required to produce one watt of power for one second, or one watt-second (W⋅s) (compare kilowatt-hour, which is 3.6 megajoules). This relationship can be used to define the watt. The joule is named after James Prescott Joule.
watt per cubic metre: W/m 3: spectral irradiance, power density: m −1 ⋅kg⋅s −3: joule per square metre second: J/(m 2 ⋅s) energy flux density: kg⋅s −3: reciprocal pascal: Pa −1: compressibility: m⋅kg −1 ⋅s 2: joule per square metre: J/m 2: radiant exposure: kg⋅s −2: kilogram square metre: kg⋅m 2: moment of inertia: m ...
The watt, kilogram, joule, and the second are part of the International System of Units (SI). The hour is not, though it is accepted for use with the SI.Since a watt equals one joule per second and because one hour equals 3600 seconds, one watt-hour per kilogram can be expressed in SI units as 3600 joules per kilogram.