Znaleźć wartość oporu R2 (patrz rysunek).

I=1 A;  E=10 V;  Rw=2 om;  R1=72 om;  R2=? [latex]U=E-I* R_{w}=10-1*2=8 V [/latex] [latex]I= frac{U}{R} => R= frac{U}{I}= frac{8}{1}=8 om [/latex] [latex]R= frac{ R_{1}*R_{2} }{ R_{1}+R_{2} }[/latex] [latex]8= frac{72* R_{2} }{72+ R_{2} }[/latex] [latex]576+8 R_{2}=72 R_{2}[/latex] [latex]64 R_{2}=576[/latex] [latex]R_{2}=9 om[/latex]