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1.999V电压表能否改量程

2025-03-17 06:02:38

推荐回答（1个）

回答1：

1.999V电压表能够通过改变串接在电压表的电阻来改量程。
电压表实际上是一个串联了很大电阻的电流表，使用时并接在需检测的电压回路中。根据欧姆定律：I=U/R，当R为常数时，流过电压表的电流与电压成正比，由此可测出回路的电压。同样，若增大电阻，就可在相同电流的情况下测得更高的电压。

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