来自孙明权的问题
如图所示，电源电压不变，要使电流表的示数最大，下列做法中正确的是（）A.S1、S2都断开B.S1断开S2闭合C.S1闭合S2断开D.S1、S2都闭合
如图所示，电源电压不变，要使电流表的示数最大，下列做法中正确的是（）
A.S1、S2都断开
B.S1断开S2闭合
C.S1闭合S2断开
D.S1、S2都闭合
1回答
2020-03-26 23:03
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赖铁明
由图可知，当S1、S2都闭合时，通过R1、R2、R3的电流路径如下图所示，
所以可以判断R1、R2和R3并联，电流表测的是干路中的总电流；根据并联电路的特点，并联电路的总电阻小于任何一条支路电阻，即此时总电阻最小，根据I=UR
2020-03-26 23:05:48
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