15问答网 > （2010?上海模拟）在如图所示电路中，电源电动势为E、内阻为r，R2、R3、R4均为定值电阻，电表都为理想电

（2010?上海模拟）在如图所示电路中，电源电动势为E、内阻为r，R2、R3、R4均为定值电阻，电表都为理想电

2025-03-17 01:45:22
推荐回答（1个）
回答1：

由于电流表的内阻不计，R1、R2、R3并联，电流表A1测量干路电流．A2测量R2、R3电流之和．A3测量R1、R2电流之和．
A、滑片向右滑动，R1值减小，R1、R2、R3三者并联的总阻值减小，干路电流增大，所以A1的读数变大．故A正确．
B、R1、R2、R3分压减小，流经R2、R3的电流均减小，所以A2的示数减小．故B错误．
C、干路电流增大，而流经R3的电流减小，所以A3的示数一定变大．故C正确．
D、干路电流增大，电源的内电压增大，则路端电压变小，电压表V的示数变小．故D正确
故选AC

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