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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![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](/uploads/image/z/1075865-41-5.jpg?t=%E5%88%9D%E4%BA%8C%E7%94%B5%E5%8A%9F%E7%8E%87%E7%89%A9%E7%90%86%E9%A2%98%7E%E9%AB%98%E6%89%8B%E6%9D%A5%E5%95%8A1.%E5%A6%82%E5%9B%BE1%E6%89%80%E7%A4%BA%2CP%E5%9C%A8%E4%B8%AD%E7%82%B9c%E6%97%B6%E5%92%8C%E7%AB%AF%E7%82%B9b%E6%97%B6%2C%E7%94%B5%E5%8E%8B%E8%A1%A8%E7%A4%BA%E6%95%B0%E4%B9%8B%E6%AF%94%E4%B8%BA3%EF%BC%9A4%2C%E6%B1%82%EF%BC%881%EF%BC%89%E7%81%AF%E7%9A%84%E7%94%B5%E9%98%BB%E4%B8%8E%E5%8F%98%E9%98%BB%E5%99%A8%E6%9C%80%E5%A4%A7%E9%98%BB%E5%80%BC%E4%B9%8B%E6%AF%94%3F++%EF%BC%882%EF%BC%89%E6%BB%91%E7%89%87c%E5%92%8Cb%E6%97%B6%2C%E7%81%AF%E6%B3%A1L%E7%9A%84%E5%8A%9F%E7%8E%87%E4%B9%8B%E6%AF%94%3F2.%E5%A6%82%E5%9B%BE%E4%BA%8C%E6%89%80%E7%A4%BA%2CR%3D5%CE%A9+%E7%94%B5%E6%BA%90%E7%94%B5%E5%8E%8B%E4%B8%BA)
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