U1=U2=I1*R1=4 B
I=U3/R3=8/2=4 A
U=U12+U3=4+8=12 B
R=U/I=12/4=3 Ом
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U1=U2=I1*R1=4 B
I=U3/R3=8/2=4 A
U=U12+U3=4+8=12 B
R=U/I=12/4=3 Ом
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