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R2=800Ω
Rs=?
Rr=?
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a. szeregowo
Rs=R1+R2=400Ω+800Ω=1200Ω=1,2kΩ
b. równolegle
Rr=R1*R2/(R1+R2)=400*800/(400+800)=267Ω
R2=800Ω
szeregowo
Rz400Ω+800Ω=1200Ω
równolegle
Rz=400*800/(400+800)=267Ω