Here, the energy in different scales can be converted.
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In SI system, the unit of energy is the Joule (J), named after the British physicist James Prescott Joule describing energy which is necessary to apply a force of 1 N over a distance of 1 metre and is also called Newtonmetre (Nm).
An other unit is the electronvolt (eV) defined by the energy which an electron receives after passing a voltage of 1 V.
In the CGS-system the energy is specified in the unit erg and is usual in theoretical physics nowadays. It is 1 erg = 1 cm2g/s2.
The watthour (Wh) is equal to the work that is conducted by a power of 1 W in one hour and is commonly used as kWh to specify energy consumption.
To express the nutritional value of food the obsolete unit kilocalory (kcal) is used. It was defined as energy being necessary to heat 1 kilogram of water by 1 Kelvin and it is 1 kcal = 4.1868 kJ.