图1是滑动变阻器在电路中的两种常见连接方法,滑动头P移动时使其两边电路的电阻同时改变,引起于路和支路的电阻、电流等物理量起复杂的变化.下面拟先分析两个电路的等效电阻再讨论含此电路的一类典型题的解法. 1.电路的等效电阻如图1所示,设变阻器的总电阻为R0,RAP=x,甲图电 Figure 1 shows two common methods of connecting the sliding rheostat in the circuit. When the slider P moves, the resistances of both sides of the circuit change simultaneously, causing complex changes in the resistance of the circuit and the branch, and the current and other physical quantities. The equivalent resistance of the two circuits then discusses a solution to a class of typical problems with this circuit. 1. The equivalent resistance of the circuit is shown in Figure 1. Let the total resistance of the varistor be R0, RAP = x, and Figure A.