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例题如图1,电源电压保持不变,滑动变阻器的最大阻值为R1=40Ω,小灯泡的电阻为10Ω且保持不变.当S1、S2均闭合且滑片P滑到
Example example shown in Figure 1, the power supply voltage remains unchanged, the maximum resistance of the sliding rheostat is R1 = 40Ω, the resistance of the small bulb is 10Ω and remains unchanged. When S1, S2 are closed and the slide P slips to