能量

焦耳，符号 J，是国际单位制中的能量、功或热量的导出单位。它等于当施加一牛顿的力通过一米的距离（1 牛顿·米或 N·m）时转移的能量（或做的功），或者当通过一欧姆的电阻通以一安培的电流一秒钟时转移的能量。还包括了许多其他能量单位。请不要把卡路里的这个定义和食品工业通俗使用的大卡路里混淆，大卡路里相当于 1 千卡。卡路里使用了热化学定义。对于英热单位，使用了 IT 定义。

The joule, symbol J, is a derived unit of energy, work, or amount of heat in the International System of Units. It is equal to the energy transferred (or work done) when applying a force of one newton through a distance of one metre (1 newton metre or N·m), or in passing an electric current of one ampere through a resistance of one ohm for one second. Many other units of energy are included. Please do not confuse this definition of the calorie with the one colloquially used by the food industry, the large calorie, which is equivalent to 1 kcal. Thermochemical definition of the calorie is used. For BTU, the IT definition is used.