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Ma ajuta Cnv la problema 3.114?? PLS

Ma Ajuta Cnv La Problema 3114 PLS class=

Răspuns :

Baiatul122001

U=RI=>I=U/R

I=E/(R+r)<=>IR+Ir=E=>r=(E-IR)/I

R₁=4R

U₁=nU+U=U(n+1)

I₁=U(n+1)/4R=I(n+1)/4

I₁=E/(R₁+r)<=>I(n+1)/4=E/(4R+(E-IR)/I)<=>4E=4RI(n+1)+I(n+1)(E-IR)/I<=>4E=4RI(n+1)+(n+1)(E-IR)<=>4E=4U(n+1)+(n+1)(E-U)<=>4E=4Un+4U+nE-nU+E-U<=>3E-nE=3Un-3U<=>E(3-n)=3U(n-1)=>E=3U(n-1)/(3-n)

B

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