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85问答库 > 测定电源电动势和内阻"实验的误差分析与比较中的等效法怎么理解?

测定电源电动势和内阻"实验的误差分析与比较中的等效法怎么理解?

2025-04-07 06:10:52

推荐回答（2个）

回答1：

虚线框内是等效电源，像普通电源一样，它两端也有电压，也有内阻。
电压表可以读出等效后的路端电压，电流表可以读出等效后的总电流。
根据测量原理，测出的实际是等效部分的总电阻，即电压表与原电源的内阻并联总电阻。

回答2：

你在心里直接把电压表用电阻RV替换，然后把电压用r0替换
然后再电压表左端交点标+xv，电压表右端标0v
就好理解了
其中x为电压表的指示电压

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