Question

 Напряжение U4=36
Найти силу тока I1

Answer 1

R23=R2*R3/(R2+R3)=4*12/(4+12)=3
R234=R23+R4=3+3=6
I23=I4=U4/R4=36/3=12 A
U23=I23*R23=12*3=36 B
U234=U5=U23+U4=36+36=72 B
I5=U5/R5=72/6=12 A
I1=I23+I5=12+12=24 A
===========================