物理计算题题十万火急.我要的是解题过程.如图16所示电路中,R1、R2为两个定值电阻,且R1+R2=8Ω;小灯泡上标有“6V 12W”字样.当开关S1、S3闭合,S2断开时,电流表示数为I;当S2、S3闭合,S1断开时
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