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Rz=R1+R2+R3+R4=5+5+5+5=20
Rownlogle
1/Rz=1/R1+1/R2+1/R3+1/R4=1/5+1/5+1/5+1/5
Rz=5/4=1,25
mieszane
R1i R2 szeregowo a R3 i R4 rownolegle
Rz=R1+R2+(R3*R4/R3+R4)
Rz=5+5+(5*5/5+5)=10+(25/10)=10+2,5=12,5
Prosze ;)