Suppose we connect a voltmeter across a dry cell.
假定我们在干电池两端接上伏特计。
The voltmeter leads are placed a known distance apart.
电压表的引线则按已知的距离放置。
Close the channel and measure the voltage with a sensitive voltmeter.
闭合通道，利用一个灵敏的伏特计测量电压。
Close the channel and measure the voltage with a sensitive voltmeter.
闭合通道，利用一个灵敏的伏特计测量电压。
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