Ответы и объяснения

2014-03-19T19:16:34+04:00
R234 = R2*R3*R4 / (R2R3+R2R4+R3R4) = 5*10*30 / (5*10+5*30+10*30) = 1500/ 500 =3 Ом
I1 = (I 2+I 3+I 4) = I5 = U5 / R5 = 12B /3 Ом = 4 А
U1 = I1*R1 = 4A*4 Ом = 16В
U2 = U3 = U4 = I 1*R234 = 4 A* 3 ОМ = 12 В
I 2 = U2/R2 = 12B /5 Ом =2,4 А
I 3 =U3/R3 = 12/10=1,2 A
I 4 = U4/R4 = 12/30 =0,4 A
U = U1+U234+U5 =16+12+12=40 B
I = I 1 = I 234 = I 5 =4 A
R = R1+ R234 +R5 =4+3+3=10 Ом