在人教版选修3-1教材中,建议了测定电源电动势和内阻的三种方法,分别是电流表、电压表与滑动变阻器的组合(简称为V-A法,如图1、图2)、电流表与电阻箱的组合(简称AR法,如图3),以及电压表与电阻箱的组合(简称V-R法,如图4). In the PEP 3-1 teaching materials, three methods for determining the electromotive force and internal resistance of the power supply are suggested. They are a combination of an ammeter, a voltmeter and a sliding rheostat (VA for short, as shown in Fig. 1 and Fig. 2), an ammeter And resistance box combination (referred to as AR method, shown in Figure 3), and the combination of voltmeter and resistance box (referred to as VR method, shown in Figure 4).