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Fem=16v.
I=1A.
Resistencia Externa (Rex)=14Ω
Resistencia Interna (Rin)=?
Resistencia Total (Rt):
Rt=Rex+Rin
Rt=14Ω+Rin
Cálculo de la Rin:
Fem=I*Rt
16v=1A*(14Ω+Rin)
16v=14v+1A*Rin
16v-14v=1A*Rin
2v=1A*Rin
Rin=2Ω
Rpta: b. 2Ω