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用伏安法测电源电动势和内电阻的实验,是中学物理电学中一个比较重要的实验,但由于中学实验设备所限,电流表内阻RA与电源内阻r相差不会太大,而电压表内阻RV与电源内阻r相差很大,因此教材中选用了电流表内接的测量电路,如图1所示.这个实验的系统误差主要是电压表和电流表的内阻?
Voltammetry with the electromotive force and internal resistance of the experiment is a more important experiment in secondary physics, but due to the limitations of secondary laboratory equipment, ammeter resistance RA and power supply resistance r will not be much difference between the voltage meter Internal resistance RV and power supply resistance r vary greatly, so the textbook selected ammeter connected to the measurement circuit shown in Figure 1. The experimental system error is mainly the internal resistance of the ammeter and ammeter?