如图所示的电路中,R1=3kΩ,R2=2kΩ,R3=1.5kΩ,R4=1kΩ,R5=2kΩ,b处接地,干路电流I=9mA.(1)当S断开时,c、d处电势各为多少?(2)当S闭合时,通过R1的电流I1=4mA,干路电流I不变,则通过R2、R3、R4的电流各为多
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![如图所示的电路中,R1=3kΩ,R2=2kΩ,R3=1.5kΩ,R4=1kΩ,R5=2kΩ,b处接地,干路电流I=9mA.(1)当S断开时,c、d处电势各为多少?(2)当S闭合时,通过R1的电流I1=4mA,干路电流I不变,则通过R2、R3、R4的电流各为多](/uploads/image/z/7924208-32-8.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%2CR1%3D3k%CE%A9%2CR2%3D2k%CE%A9%2CR3%3D1.5k%CE%A9%2CR4%3D1k%CE%A9%2CR5%3D2k%CE%A9%2Cb%E5%A4%84%E6%8E%A5%E5%9C%B0%2C%E5%B9%B2%E8%B7%AF%E7%94%B5%E6%B5%81I%3D9mA%EF%BC%8E%EF%BC%881%EF%BC%89%E5%BD%93S%E6%96%AD%E5%BC%80%E6%97%B6%2Cc%E3%80%81d%E5%A4%84%E7%94%B5%E5%8A%BF%E5%90%84%E4%B8%BA%E5%A4%9A%E5%B0%91%3F%EF%BC%882%EF%BC%89%E5%BD%93S%E9%97%AD%E5%90%88%E6%97%B6%2C%E9%80%9A%E8%BF%87R1%E7%9A%84%E7%94%B5%E6%B5%81I1%3D4mA%2C%E5%B9%B2%E8%B7%AF%E7%94%B5%E6%B5%81I%E4%B8%8D%E5%8F%98%2C%E5%88%99%E9%80%9A%E8%BF%87R2%E3%80%81R3%E3%80%81R4%E7%9A%84%E7%94%B5%E6%B5%81%E5%90%84%E4%B8%BA%E5%A4%9A)
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