初二电功率物理题~高手来啊1.如图1所示,P在中点c时和端点b时,电压表示数之比为3:4,求(1)灯的电阻与变阻器最大阻值之比? (2)滑片c和b时,灯泡L的功率之比?2.如图二所示,R=5Ω 电源电压为
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