为获得0.01欧的电阻,问需要用多少只1欧的电阻并联

问题描述:

为获得0.01欧的电阻,问需要用多少只1欧的电阻并联

如果是R1和R2并联
则总电阻为R=R1R2/(R1+R2)
如果R1、R2和R3并联
则总电阻为R=R1R2R3/(R1R2+R2R3+R1R3)
同理Rn=R1R2R3......Rn/(R2R3.....Rn+R1R3R4.....Rn+R1R2R4R5.....Rn+....+R1R2..Rn-1)
Rn=0.01求n

多并联几个电阻啊

100个,0.01=1/n,n=100