假定我们在干电池两端接上伏特计。

Suppose we connect a voltmeter across a dry cell.

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假定我们在干电池两端接上伏特计。

Suppose we connect a volt meter across a dry cell.

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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.

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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.

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