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如图a所示电路中，当闭合开关后，两个电压表的指针均为图b所示，灯泡L1两端的电压 V．
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在图a所示电路中当闭合开关后两个电压表指针偏转均为图b所示则电阻R1两端的电压为_______电阻R
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在图a所示电路中闭合开关s后两个电压表指针偏转均为图b所示求1电源电压2电阻R.1和R.2两端的电压
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