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实验原理:E=U+Ir,即如果测的确实是路端电压U和干路电流I,则不存在系统误差。在图甲电路中,电流表测的是流过电源的电流,是干路电流;但是电压表测的是滑动变阻器的电压,不是路端电压,误差由此产生。如果我们要把此时电压表测的电压认为是路端电压的话,
Experimental principle: E = U + Ir, that is, if the measured voltage is really road terminal voltage U and I, there is no systematic error. In Tujia circuit, the ammeter measures the current flowing through the power supply and is the current of the main circuit; however, the voltmeter measures the voltage of the sliding rheostat instead of the voltage of the road and the error is generated. If we want to measure the voltmeter at this time that the voltage is the roadside voltage,