1. is expressed in units of joules per coulomb, or volts. 在国际单位制中，电势的单位为焦耳）/库仑，简称伏特。
2. The observed cosmic energy density is about 10-9 joule per cubic meter, so the universe contains 1072 joules of energy. 由于观测到的宇宙能量密度约为每立方公尺10-9焦耳，所以宇宙所含能量为1072焦耳。
3. A unit of energy, especially electrical energy, equal to the work done by one watt acting for one hour and equivalent to3, 600 joules. 瓦特小时能量单位，尤指电能，等于一瓦特一小时所做的功，相当于3，600焦耳。
