电源恒定电压为12v,R1为定值电阻,R2为标有“100Ω 0.5A”字样的滑动变阻器,R3为标有“3v 0.9A”字样的定值电阻.(1)当闭合S,S1,S2时,电流表的示数为0.3A,求R1的阻值及这种情况下整个电路可能消
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![电源恒定电压为12v,R1为定值电阻,R2为标有“100Ω 0.5A”字样的滑动变阻器,R3为标有“3v 0.9A”字样的定值电阻.(1)当闭合S,S1,S2时,电流表的示数为0.3A,求R1的阻值及这种情况下整个电路可能消](/uploads/image/z/2121467-59-7.jpg?t=%E7%94%B5%E6%BA%90%E6%81%92%E5%AE%9A%E7%94%B5%E5%8E%8B%E4%B8%BA12v%2CR1%E4%B8%BA%E5%AE%9A%E5%80%BC%E7%94%B5%E9%98%BB%2CR2%E4%B8%BA%E6%A0%87%E6%9C%89%E2%80%9C100%CE%A9++0.5A%E2%80%9D%E5%AD%97%E6%A0%B7%E7%9A%84%E6%BB%91%E5%8A%A8%E5%8F%98%E9%98%BB%E5%99%A8%2CR3%E4%B8%BA%E6%A0%87%E6%9C%89%E2%80%9C3v++0.9A%E2%80%9D%E5%AD%97%E6%A0%B7%E7%9A%84%E5%AE%9A%E5%80%BC%E7%94%B5%E9%98%BB.%EF%BC%881%EF%BC%89%E5%BD%93%E9%97%AD%E5%90%88S%2CS1%2CS2%E6%97%B6%2C%E7%94%B5%E6%B5%81%E8%A1%A8%E7%9A%84%E7%A4%BA%E6%95%B0%E4%B8%BA0.3A%2C%E6%B1%82R1%E7%9A%84%E9%98%BB%E5%80%BC%E5%8F%8A%E8%BF%99%E7%A7%8D%E6%83%85%E5%86%B5%E4%B8%8B%E6%95%B4%E4%B8%AA%E7%94%B5%E8%B7%AF%E5%8F%AF%E8%83%BD%E6%B6%88)
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