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R串>R2>R1>R.并 R并>R.串>R2>R1 R串>R.并>R1>R2 R串>R.并>R2>R1
r1+r2 r1*r2 ≤r1*r2 ≥r1*r2
流过R1的电流是R2的N倍,R1消耗的功率是R2的N^2倍 流过R1的电流是R2的1/N,R1消耗的功率是R2的1/N 流过R1的电流与R2的相同,R1消耗的功率是R2的1/N^2 流过R1的电流与R2的相同,R1消耗的功率是R2的N倍
I1 =R1 I/(R1 +R2 ) I1 =R2 I/(R1 +R2 ) I1 =R1 I/(R1 ×R2 ) I1 =(R1 +R2 ) I/R1
R1两端的电压是R2的N倍,R1消耗的功率是R2的N倍 R1两端的电压是R2的1/N,R1消耗的功率是R2的1/N^2 R1两端的电压与R2的相同,R1消耗的功率是R2的1/N R1两端的电压与R2的相同,R1消耗的功率是R2的N^2倍
r1+r2 r1×r2 ≤r1×r2 ≥r1×r2
r1+r2 ri*r2 ≤r1*r2 ≥r1*r2
rl+r2 rl×r2 ≤rl×r2 ≥r1×r2
R1两端的电压与R2的相同,R1消耗的功率是R2的1/N R1两端的电压与R2的相同,R1消耗的功率是R2的N^2倍 R1两端的电压是R2的1/N,R1消耗的功率是R2的1/N^2 R1两端的电压是R2的N倍,R1消耗的功率是R2的N^2倍
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)]