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U1=4V
R1=8Ω
I=?
U2=?
R2=?
Rz=?
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I=U1/R1=4V/8Ω=0,5A
U=U1+U2
U2=U-U1=12V-4V=8V
R2=U2/I=8V/0,5A=16Ω
Rz=R1+R2=8Ω+16Ω=24Ω