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A watt-second (symbol W s or W⋅s) is a derived unit of energy equivalent to the joule. [34] The watt-second is the energy equivalent to the power of one watt sustained for one second . While the watt-second is equivalent to the joule in both units and meaning, there are some contexts in which the term "watt-second" is used instead of "joule ...
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 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 .
Energy; system unit code (alternative) symbol or abbrev. notes sample default conversion combinations SI: yottajoule: YJ YJ 1.0 YJ (2.8 × 10 17 kWh) zettajoule: ZJ ZJ 1.0 ZJ (2.8 × 10 14 kWh)
[1] [3] The small calorie or gram calorie is defined as the amount of heat needed to cause the same increase in one milliliter of water. [ 3 ] [ 4 ] [ 5 ] [ 1 ] Thus, 1 large calorie is equal to 1,000 small calories.
Symbol [1] Name of quantity Unit name Symbol Base units E energy: joule: J = C⋅V = W⋅s kg⋅m 2 ⋅s −2: Q electric charge: coulomb: C A⋅s I electric current: ampere
The solar flux unit is a unit of spectral irradiance equal to 10 −22 W⋅m −2 ⋅Hz −1 (100 yW⋅m −2 ⋅Hz −1). The nox (nx) is a unit of illuminance equal to 1 millilux ( 1 mlx ). The nit (nt) is a unit of luminance equal to one candela per metre squared ( 1 cd⋅m −2 ).
Theoretical total mass–energy of 1 gram of matter (25 GW·h) [177] 10 14 1.8×10 14 J Energy released by annihilation of 1 gram of antimatter and matter (50 GW·h) 3.75×10 14 J: Total energy released by the Chelyabinsk meteor. [178] 6×10 14 J: Energy released by an average hurricane per day [179] 10 15: peta-(PJ) > 10 15 J