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I*R=U
5*3=15
I=15*15=225 V
U=J1*R1
U=J2*R2
J1*R1=J2*R2
J2=J1*R1/R2= podstawic i obliczyc =1 A
R=5 ohm
i=3A
U=15V
Rz=20ohm
I=U/R
I=0.75A