The electron volt is not a unit of potential difference.
电子伏特不是，就是一单位的电子伏特。
What is the unit of potential difference? Volt.
势能差的单位是什么，伏特。
Electric potential can be thought of as potential energy per unit charge.
电势可比作每单位电荷的位能。
Electric potential can be thought of as potential energy per unit charge.
电势可比作每单位电荷的位能。
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