Question

Care este rezistenta echivalenta a portiunii de circuit electric din figura data ?

Answer 1

ai 2R cu 2R in paralel, iar Rp=4R^2/4R=R

Answer 2

$\displaystyle R_1=R+R \Rightarrow R_1=2R \\ \\ R_2=R+R\Rightarrow R_2=2R\\ \\ \frac{1}{R_e} =\frac{1}{R_1} +\frac{1}{R_2} \Rightarrow \frac{1}{R_e} =\frac{R_1+R_2}{R_1R_2} \Rightarrow R_e=\frac{R_1R_2}{R_1+R_2} \Rightarrow \\ \\ \Rightarrow R_e=\frac{2R \cdot 2R}{2R+2R} \Rightarrow R_e=\frac{4R^2}{4R} \Rightarrow \mathbf{R_e=R}$