Question

Помогите решить пожалуйста

Answer 1

1 )

I1 = I2 

$\frac{U1}{R1} = \frac{U2}{R2}$

U2 = $\frac{U1*R2}{R1}$ = 36*3/9 = 12 В

I = $\frac{U1}{R1}$ = 36/9 = 4 A

2 ) I = $\frac{U}{R}$
$\frac{1}{R} = \frac{1}{R1} + \frac{1}{R2} + \frac{1}{R3}$

$\frac{1}{R}=\frac{1}{30} + \frac{1}{10} + \frac{1}{30}=\frac{5}{30}$
$R = \frac{30}{5} = 6$ Ом

I = $\frac{U}{R}$ = $\frac{6}{6}$ = 1 A