1/R567=1/R1+1/R2+1/R3
1/R567=1/36+1/6+1/12=11/36
R567=36/11=3,2 (Ом)
R34=R3*R4/(R3+R4)
R34=10*40/(10+40)=8 (Ом)
R12=R1/N
R12=12/2=6 (Ом)
R(12)(34)(567)=R12+R34+R567
R(12)(34)(567)=6+8+3,2=17,2 (Ом)
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Answers & Comments
1/R567=1/R1+1/R2+1/R3
1/R567=1/36+1/6+1/12=11/36
R567=36/11=3,2 (Ом)
R34=R3*R4/(R3+R4)
R34=10*40/(10+40)=8 (Ом)
R12=R1/N
R12=12/2=6 (Ом)
R(12)(34)(567)=R12+R34+R567
R(12)(34)(567)=6+8+3,2=17,2 (Ом)