如图所示的电路中,电源电压保持不变,电流表的量程为0-3A,R2为滑动变阻器,此时滑片P位于中点.当开关S1闭合,S2、S3断开时,R1消耗的功率为6W;再闭合S2,电路消耗的总功率为9W,电流表的示数较
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![如图所示的电路中,电源电压保持不变,电流表的量程为0-3A,R2为滑动变阻器,此时滑片P位于中点.当开关S1闭合,S2、S3断开时,R1消耗的功率为6W;再闭合S2,电路消耗的总功率为9W,电流表的示数较](/uploads/image/z/5311582-70-2.jpg?t=%E5%A6%82%E5%9B%BE%E6%89%80%E7%A4%BA%E7%9A%84%E7%94%B5%E8%B7%AF%E4%B8%AD%2C%E7%94%B5%E6%BA%90%E7%94%B5%E5%8E%8B%E4%BF%9D%E6%8C%81%E4%B8%8D%E5%8F%98%2C%E7%94%B5%E6%B5%81%E8%A1%A8%E7%9A%84%E9%87%8F%E7%A8%8B%E4%B8%BA0-3A%2CR2%E4%B8%BA%E6%BB%91%E5%8A%A8%E5%8F%98%E9%98%BB%E5%99%A8%2C%E6%AD%A4%E6%97%B6%E6%BB%91%E7%89%87P%E4%BD%8D%E4%BA%8E%E4%B8%AD%E7%82%B9%EF%BC%8E%E5%BD%93%E5%BC%80%E5%85%B3S1%E9%97%AD%E5%90%88%2CS2%E3%80%81S3%E6%96%AD%E5%BC%80%E6%97%B6%2CR1%E6%B6%88%E8%80%97%E7%9A%84%E5%8A%9F%E7%8E%87%E4%B8%BA6W%EF%BC%9B%E5%86%8D%E9%97%AD%E5%90%88S2%2C%E7%94%B5%E8%B7%AF%E6%B6%88%E8%80%97%E7%9A%84%E6%80%BB%E5%8A%9F%E7%8E%87%E4%B8%BA9W%2C%E7%94%B5%E6%B5%81%E8%A1%A8%E7%9A%84%E7%A4%BA%E6%95%B0%E8%BE%83)
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