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R1=R3=R4=4Ω
R2=2Ω
R5=6Ω
Rz=?
I1=?
I2=?
I3=?
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Rz1=R3*R4/(R3+R4)=4*4/(4+4)=2Ω
Rz=R1+R2+Rz1+R5=4Ω+2Ω+2Ω+6Ω=14Ω
I1=U/Rz=28V/14Ω=2A
U34=I1*Rz1=2A*2Ω=4V
I2=U34/R3=4V/4Ω=1A
I3=U34/R4=4V/4Ω=1A