Question

两个定值电阻R1和R2,已知R1=nR2,现将这两个电阻串联后接在电压为U的电源两端时,它们两端的电压分别为

Answer 1

两个电阻串联 则电路总电阻

R=R1+R2=nR2+R2=(1+n)R2

则有

U1=(R1/R)U=(nR2/(1+n)R2))U=(n/(1+n))U

U2=(R2/R)U=(R2/(1+n)R2))U=(1/(1+n))U