Se da:
R1=1ohm
I1=1A
R2=2,5ogm
I2=2,5A
r=?
E=?
Formule:
[tex] \left \{ {{I1= \frac{E}{R1+r} } \atop {I2= \frac{E}{R2+r} }} \right.\ \textless \ =\ \textgreater \ \left \{ {{E=I1(R1+r)} \atop {I2(R2+r)=I1(R1+r)}} \right. \ \textless \ =\ \textgreater \ \left \{ {{E=I1(R1+r)} \atop {I2R2+I2r=I1R1+I1r}} \right.\\
\left \{ {{E=I1(R1+r)} \atop {r(I2-I1)=I1R1-I2R2}} \right.\ \textless \ =\ \textgreater \ \left \{ {{E=I1(R1+r)} \atop {r= \frac{I1R1-I2R2}{I2-I1} }} \right.\\
Inlocuiesti;aflii.[/tex]
