Es=nE=4R
Ep=E
rp=r/n=r/4
rs=nr=4r
Is=Es/(R+rs)=4E/(R+4r)
Ip=Ep/(R+rp)=E/(R+r/4)
Ps=Pp=P=12,8 W
Ps=RIs²=16E²R/(R+4r)²
Ps=12,8=>16E²R/(R+4r)²=12,8<=>E²R=0,8(R²+16r²+8Rr)<=>E²R=0,8R²+12,8r²+6,4Rr (1)
Pp=RIp²=E²R/(R+r/4)²
Pp=12,8=>E²R/(R+r/4)²=12,8<=>E²R=12,8(R²+r²/16+Rr/2)<=>E²R=12,8R²+0,8r²+6,4Rr (2)
(1)-(2)=>0=-12R²+12r²=>R=r
E²R=0,8R²+12,8R²+6,4R²=20R²=>E²=20R
I=E/(R+r)=E/2R
P₁=RI²=R*E²/4R²=20R/4R=5 W
