Ответ:
Объяснение:
U2=U1= 30 B - По условию
I2 = U2/R2 = 30/4 = 7.5A
I3 = U3/ R3 = 30 / 12 = 2.5 A
I1= I3+I2 = 2.5+7.5 = 10A
U1 = I1*R1 = 10*6.4 = 64 B
r456 = R4*R5*R6 / (R4*R5+R5*R6+R4*R6) = 6*3*8 / (6*3+3*8+6*8) = 1.6 Ом
U4=U5=U6= I1*r = 10* 1.6 = 16 B
I4 = U4 / R4 = 16 / 6 == 2.67 A
I5 = U4 / R5 = 16 / 3 == 5.3 A
I6 = U4 / R6 = 16 / 8 == 2 A
U = U7=U1+U2+U4 = 64+30+16 = 110 B - общее напряжение
I7 = U/R7 = 110 / 20 = 5.5 A
I = I1+I7 = 10+ 5.5 = 15.5 A - общий ток