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问题 选择题

在如图所示电路中，电源电压恒定，电阻R1=10Ω，开关S闭合前后，电压表示数之比为1:3，则下列说法中错误的是：

[ ]

A．S闭合后，R2两端的电压为0　　　　

B．R2的阻值是30Ω　

C．R2的阻值是20Ω　　　　　　　　　　　　

D．S闭合后，通过R1的电流增大了2倍

答案

B

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