Question

R1为定值电阻,电源电压恒定,闭合开关,当滑动变阻器电路的电阻

Answer 1

I:I'=U1/R1:U1'/R1=6:3=2:1

设电源电压为U

(U-6)/(R/4):(U-3)/R=4(U-6):(U-3)=2:1

U=9V