Question

Va rog mult. Problema din poza. Urgent

Answer 1

Es=nE=3E

rs=nr=3r

Ep=E

rp=r/n=r/3

Ip=Ep/(R+rp)=E/(R+r/3)

Is=Es/(R+rs)=3E/(R+3r)

Ip=Is=>E/(R+r/3)=3E/(R+3r)<=>1/(R+r/3)=3/(R+3r)=>R+3r=3R+r<=>-2R=-2r |:r=>R/r=1