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The watt (symbol: W) is the unit of power or radiant flux in the International System of Units (SI), equal to 1 joule per second or 1 kg⋅m 2 ⋅s −3. [1] [2] [3] It is used to quantify the rate of energy transfer.
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.
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.
Electric power is the rate of transfer of electrical energy within a circuit.Its SI unit is the watt, the general unit of power, defined as one joule per second.Standard prefixes apply to watts as with other SI units: thousands, millions and billions of watts are called kilowatts, megawatts and gigawatts respectively.
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.
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 ...
1 einstein = 1 mol × N A h f = 1 mol × 6.022 140 76 × 10 23 mol −1 × 6.626 070 15 × 10 −34 J⋅s × f = 3.990 312 712 893 4321 × 10 −10 J⋅s × f, where N A is the Avogadro constant, h is the Planck constant, and f is the frequency.
The joule-second (symbol J⋅s or J s) is the unit of action and of angular momentum in the International System of Units (SI) equal to the product of an SI derived unit, the joule (J), and an SI base unit, the second (s). [1] The joule-second is a unit of action or of angular momentum. The joule-second also appears in quantum mechanics within ...