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R3=3Ω
R4=1Ω
Rz=?
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R3 i R4 połączone równolegle
1/Rz1=1/R3+1/R4
1/Rz1=1/1+1/3
1/Rz1=4/3
Rz1=3/4=0,75Ω
R1, Rz1 i R2 są połączone szeregowo
Rz=R1+Rz1+R2=2Ω+0,75Ω+2Ω=4,75Ω