这是一个8 V的电池。
What is the unit of potential difference? Volt.
势能差的单位是什么，伏特。
Suppose we connect a volt meter across a dry cell.
假定我们在干电池两端接上伏特计。
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。
A unit of potential equal to one thousandth of a volt.
电压单位等于千万分之一伏特。
Where the volt is too large a unit, we use the millivolt or microvolt.
如果伏特这个单位过大，我们就用毫伏或微伏。
Now, you will need a common nine-volt battery and a metal piece of money.
现在你需要一节普通的9伏电池和一枚金属钱币。
Its Volt has a backup engine to power the car when the electricity drains out.
当电能耗尽时，它有一个储备电压的发动机能给汽车带来强大的动力。
Both water and power is in good supply and it has two 110,000 volt transformer stations.
自来水供应充足，电力充裕，拥有11万伏变电站两座。
Both water and power is in good supply and it has two 110,000 volt transformer stations.
自来水供应充足，电力充裕，拥有11万伏变电站两座。
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