When measuring the voltage across a dry cell with a voltmeter, it reads around 1.5 volts when new and around 1.2 volts when old. The correct statement is that the electromotive force (EMF) of the old dry cell is 1.5 volts.
用电压表检查一节干电池两端电压，未使用时测得1.5伏左右，用旧后测得1.2伏左右。正确的说法是旧干电池的电动势为1.5伏。
| 正面 | LK0436 用电压表检查一节干电池两端电压，未使用时测得1.5伏左右，用旧后测得1.2伏左右。正确的说法是： |
|---|---|
| 背面 | 旧干电池的电动势为1.5伏 |
Tags: 电池
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