1. 1/R3,4,5=1/R3+1/R4+1/R5=1/2+1/2+1/2=3/2 => R3,4,5=2/3 Oм
R1,2=R1+R2=2+2=4 Oм
R=R3,4,5 +R1, 2=2/3+4=4 2/3=14/3~5 Ом
2. 1/R2, 3,4=1/R2+1/R3+1/R4=1/4+1/6+1/12=6/12=1/2=> R2, 3,4=2 Oм
R=R1+R2, 3,4=1,6+2=3,6 Ом
U=U1=U2=U3=U4=18 В
I1=U1/R1=18/1,6=11,25 A
I2=U2/R2=18/4=4,5 A
I3=U3/R3=18/6=3 A
I4=U4/R4=18/12=1,5 A
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Answers & Comments
1. 1/R3,4,5=1/R3+1/R4+1/R5=1/2+1/2+1/2=3/2 => R3,4,5=2/3 Oм
R1,2=R1+R2=2+2=4 Oм
R=R3,4,5 +R1, 2=2/3+4=4 2/3=14/3~5 Ом
2. 1/R2, 3,4=1/R2+1/R3+1/R4=1/4+1/6+1/12=6/12=1/2=> R2, 3,4=2 Oм
R=R1+R2, 3,4=1,6+2=3,6 Ом
U=U1=U2=U3=U4=18 В
I1=U1/R1=18/1,6=11,25 A
I2=U2/R2=18/4=4,5 A
I3=U3/R3=18/6=3 A
I4=U4/R4=18/12=1,5 A