R1R2/R1+R2 R1R2/R1+R2

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R1R2/R1+R2R1R2/R1+R2R1R2/R1+R2R1R2/R1+R2R1R2/R1+R2R1R2/R1+R2这是求并联电阻R1、R2的等效电阻1/R总=1/R1+1/R2=R2/R1R2+

R1R2/R1+R2 R1R2/R1+R2
R1R2/R1+R2
R1R2/R1+R2

R1R2/R1+R2 R1R2/R1+R2
这是求并联电阻R1、R2的等效电阻
1/R总=1/R1+1/R2=R2/R1R2 + R1/R1R2 =(R1+R2)/R1R2
R总=R1R2/(R1+R2)
对于多个的电阻 
1/R总=1/R1+1/R2+1/R3+.+1/Rn
即总电阻的倒数等于各分电阻的倒数之和
 对于n个相等的电阻串联和并联,公式就简化为R串=n*R和R并=R/n

是两个电阻R1和R2的并联总电阻
1/R=1/R1+1/R2=R2/R1R2 + R1/R1R2 =(R1+R2)/R1R2
R=R1R2/(R1+R2)

两个电阻并联的电阻和公式:
∵I1=U/R1,I2=U/R2
∴I=I1+I2=U/R1+U/R2
∴R=U/I = U/(U/R1+U/R2) = R1R2/(R1+R2)

表示的是并联电路中的总电阻