[tex]t=1 min=60 s\\E_s=\sum\limits^n_{i=1} {E_i} \, \\r_s=\sum\limits^n_{i=1} {E_i} \, \\[/tex]
sursele sunt identice=>[tex]E_s=nE\\r_s=nr[/tex]
[tex]n=10\\E_s=nE=10*12=120V\\r_s=nr=10*1=10\Omega\\I=\frac{E_s}{R+r_s}=\frac{120}{10+10}= 6A\\W=RI^2t=10*6^2*60=21600 J[/tex]