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I = U/R
Rz = 2 Ω + 4 Ω + 6 Ω = 12 Ω
I = 12 V / 12 Ω = 1 A
b)
U = R * I
U1 = 2 Ω * 1 A = 2 V
U2 = 4 Ω * 1 A = 4 V
U3 = 6 Ω * 1 A = 6 V
I=U/R
I=12/12=1A
U1=1*2=2V
U2=1*4=4V
U3=1*6=6V