Pegging the kilogram to planck 's constant-and the ampere to fundamental charge-will bring electrical units back into the fold .
通过普朗克常数确定千克和通过基本电荷确定安培一起将把电学单位带回常轨。
The volt was officially established in 1881 as an electrical potential of 1 joule per coulomb of charge , or the electromotive force that will cause a current of 1 ampere to flow through a resistance of 1 ohm .