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The watt-second is a unit of energy, equal to the joule. One kilowatt hour is 3,600,000 watt seconds. While a watt per hour is a unit of rate of change of power with time, [iii] it is not correct to refer to a watt (or watt-hour) as a watt per hour. [36]
The joule (/ dʒ uː l / JOOL, or / dʒ aʊ l / JOWL; symbol: J) is the unit of energy in the International System of Units (SI). [1] In terms of SI base units, one joule corresponds to one kilogram-square metre per square second (1 J = 1 kg⋅m 2 ⋅s −2).
When performance is defined as operations / second , then performance per watt can be written as operations / watt-second . Since a watt is one joule / second , then performance per watt can also be written as operations / joule .
Energy densities table Storage type Specific energy (MJ/kg) Energy density (MJ/L) Peak recovery efficiency % Practical recovery efficiency % Arbitrary Antimatter ...
A unit of electrical energy, particularly for utility bills, is the kilowatt-hour (kWh); [3] one kilowatt-hour is equivalent to 3.6 megajoules.Electricity usage is often given in units of kilowatt-hours per year or other periods. [4]
cubic metre per kilogram: m 3 /kg specific volume: m 3 ⋅kg −1: joule-second: J⋅s action: m 2 ⋅kg⋅s −1: joule per kilogram: J/kg specific energy: m 2 ⋅s −2: joule per cubic metre: J/m 3: energy density: m −1 ⋅kg⋅s −2: newton per metre: N/m = J/m 2: surface tension, stiffness: kg⋅s −2: watt per square metre: W/m 2 ...
TNT equivalent is a convention for expressing energy, typically used to describe the energy released in an explosion.The ton of TNT is a unit of energy defined by convention to be 4.184 gigajoules (1 gigacalorie), [1] which is the approximate energy released in the detonation of a metric ton (1,000 kilograms) of TNT.
The SI unit of power for heating and cooling systems is the watt. Btu per hour (Btu/h) is sometimes used in North America and the United Kingdom - the latter for air conditioning mainly, though "Btu/h" is sometimes abbreviated to just "Btu". [18] MBH—thousands of Btu per hour—is also common. [19] 1 W is approximately 3.412142 Btu/h [20]