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电压表测电压必须有电流通过吗

2025-03-15 22:48:55

推荐回答（1个）

回答1：

电压表测电压一定有电流流入电压表。
电压表实质上就是一个高阻电流表。当电压表的接入电路中不同电位的两个点，电流会从高电位流入低电位。
电路中两个不同电位的的点不一定有电流流过，如电池的两个极。
而电压表内部是一个通路，所以电流会从高电位流入电压表，在从低电位流回电路。

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