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流过R1的电流为6mA,流过R2的电流为3mA 流过R1的电流为3mA,流过R2的电流为6mA 流过R1和R2的电流皆为2mA 流过R1的电流为2mA,流过R2的电流为lmA
R串>R2>R1>R.并 R并>R.串>R2>R1 R串>R.并>R1>R2 R串>R.并>R2>R1
R2=(R•Rx)/R1 Rx=(R•R2)/R1 R1=(R•Rx)/R2 Rx=(R1•R2)/R
流过R1的电流为6mA,流过R2的电流为3mA 流过R1的电流为3m流过R2的电流为6mA 流过R1和R2的电流皆为2mA 流过R1的电流为2m流过R2的电流为1mA
R1+R2-R1*R2 (R1*R2)/(R1+R2) (R1+R2)/(R1*R2)
R1>R.>R2 R.>R1>R2 R1<R.<R2 R.<R1<R2
R1+R2 R1·R2 R1·R2/R1+R2 R1+R2/R1·R2
R1+R2 R1·R2 R1·R2/(R1+R2) R1+R2/R1·R2 (R1+R2)/R1·R2
I[R2 /(R1 +R2)] I[R1 /(R1 +R2)] I I[1 /(R1 +R2)]