势能差的单位是什么，伏特。

What is the unit of potential difference? Volt.

youdao

或者用我最喜欢的单位，就是19。80电子伏特。

Or, in my favorite unit, 19.80 electron volts.

youdao

就是一单位的电子伏特。

That is one electron volt.

youdao

What people did is they said let's define a unit of energy that represents a unit charge accelerated across a unit potential difference, and let's call that the electron volt.

前人们所做的就是他们说让我们确定,一个能量单位用来代表一单位电荷,加速穿过形成的一单位电势差，我们叫它电子伏特。

麻省理工公开课 - 固态化学导论课程节选

And what if I took a unit charge and I multiplied it times unit voltage, one volt?

如果我取个元负荷,让它乘上个电压单位，一伏特？

麻省理工公开课 - 固态化学导论课程节选

Or, in my favorite unit, 19.80 electron volts.

或者用我最喜欢的单位，就是19。80电子伏特。

麻省理工公开课 - 固态化学导论课程节选