如图所示,R1=20欧,S1、S2闭合时,R1的功率为1.8W;再闭合S3,电流表的示数变为1.05A(已知R2>R1)①求电源电压②求电灯泡的电阻③只闭合S3,当滑动变阻器滑片滑至中点与滑至阻值最大处是,电流表变化0.
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![如图所示,R1=20欧,S1、S2闭合时,R1的功率为1.8W;再闭合S3,电流表的示数变为1.05A(已知R2>R1)①求电源电压②求电灯泡的电阻③只闭合S3,当滑动变阻器滑片滑至中点与滑至阻值最大处是,电流表变化0.](/uploads/image/z/2077759-55-9.jpg?t=%E5%A6%82%E5%9B%BE%E6%89%80%E7%A4%BA%2CR1%3D20%E6%AC%A7%2CS1%E3%80%81S2%E9%97%AD%E5%90%88%E6%97%B6%2CR1%E7%9A%84%E5%8A%9F%E7%8E%87%E4%B8%BA1.8W%3B%E5%86%8D%E9%97%AD%E5%90%88S3%2C%E7%94%B5%E6%B5%81%E8%A1%A8%E7%9A%84%E7%A4%BA%E6%95%B0%E5%8F%98%E4%B8%BA1.05A%28%E5%B7%B2%E7%9F%A5R2%3ER1%29%E2%91%A0%E6%B1%82%E7%94%B5%E6%BA%90%E7%94%B5%E5%8E%8B%E2%91%A1%E6%B1%82%E7%94%B5%E7%81%AF%E6%B3%A1%E7%9A%84%E7%94%B5%E9%98%BB%E2%91%A2%E5%8F%AA%E9%97%AD%E5%90%88S3%2C%E5%BD%93%E6%BB%91%E5%8A%A8%E5%8F%98%E9%98%BB%E5%99%A8%E6%BB%91%E7%89%87%E6%BB%91%E8%87%B3%E4%B8%AD%E7%82%B9%E4%B8%8E%E6%BB%91%E8%87%B3%E9%98%BB%E5%80%BC%E6%9C%80%E5%A4%A7%E5%A4%84%E6%98%AF%2C%E7%94%B5%E6%B5%81%E8%A1%A8%E5%8F%98%E5%8C%960.)
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