R123=R1/3=15/3=5 Ом R45=R4/2=20/2=10 Ом R=R123+R45=5+10=15 Ом I=U/R=40/15=2,67 A
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R123=R1/3=15/3=5 Ом R45=R4/2=20/2=10 Ом R=R123+R45=5+10=15 Ом I=U/R=40/15=2,67 A