1)
U12=U1+U2=32-U3=32-8=24 B
R12=R1+R2=2+4=6 Ом
I1=I2=U12/R12=24/6 = 4A
U1=I1*R1=4*2=8 B
U2=I2*R2=4*4=16 B
I = I3=I1=I2= 4A
R3=U3/I3=8/4 = 2 Ом
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U1= 8B; U2= 16B; R3=2 Ом;I = 4A
2)
I1=U/R1=3,6/6=0,6 А
I2=U/R2=3,6/9=0,4 А
I=I1+I2=0,6+0,4=1 A
R12=R1*R2/(R1+R2)=6*9/(6+9)=3,6 Ом
или
R12=U/I=3,6/1 =3,6 Ом
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I1=0,6 А; I2=0,4 А; I=1 A;R=3,6 Ом
3)
U1=U2=12 B
R1=U1/I1=12/4=3 Ом
I2 = U2/R2 = 12/6 = 2A
I = I3 = I1+I2= 2+4 = 6A
U3=R3*I3=3*6=18 В
U = U1+U3=U2+U3=12+18=30 B
R=R1*R2/(R1+R2)+R3=3*6/(3+6)+3=5 Ом
или
R=U/I=30/6= 5 Ом
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R1=3 Ом; I2 = 2A; I3 =6A; U3=18 В; U = 30 B; R= 5 Ом