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=160 W
Ps=RIs²=16E²R/(R+4r)²
Ps=160=>16E²R/(R+4r)²=160<=>E²R=10(R²+16r²+8Rr)<=>E²R=10R²+160r²+80Rr (1)
Pp=RIp²=E²R/(R+r/4)²
Pp=160=>E²R/(R+r/4)²=160<=>E²R=160(R²+r²/16+Rr/2)<=>E²R=160R²+10r²+80Rr (2)
(1)-(2)=>0=-150R²+150r²=>R=r
E²R=10R²+160R²+80R²=250R²=>E²=250R
I=E/(R+r)=E/2R
P₁=RI²=R*E²/4R²=250R/4R=62,5 W
