电源电压E,定值电阻R2,电压表示数U
(1) P在B时 U = 1.5A * R1 = 9V
R1 = 6欧
(2) I = 6V / (R1/2) = 2A
E = 1.5A * ( R2 + R1 )
E = 2A * (R2 + R12/2)
解得 E = 18V
R2 = 6欧
都是用 U = I * R 的公式的~好好分析下就好了
电源电压E,定值电阻R2,电压表示数U
(1) P在B时 U = 1.5A * R1 = 9V
R1 = 6欧
(2) I = 6V / (R1/2) = 2A
E = 1.5A * ( R2 + R1 )
E = 2A * (R2 + R12/2)
解得 E = 18V
R2 = 6欧
都是用 U = I * R 的公式的~好好分析下就好了