Question

Ajutați-mă plz, dau coroana, cat mai repede posibil​

Answer 1

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Answer 2

$\displaystyle E=52~V;~r=2~\Omega;~U=51~V\\ \\ I=\frac{E}{R+r} \Rightarrow I(R+r)=E \Rightarrow IR+Ir=E \\ \\ I=\frac{U}{R} \Rightarrow U=IR\\ \\ IR+Ir=E\Rightarrow U+Ir=E\Rightarrow 51+I \cdot 2=52 \Rightarrow 2I=52-51 \Rightarrow \\ \\ \Rightarrow 2I=1 \Rightarrow I=\frac{1}{2}\Rightarrow I=0,5~A\\ \\ IR+Ir=E \Rightarrow IR=E-Ir\Rightarrow R=\frac{E-Ir}{I}\Rightarrow R=\frac{52-0,5 \cdot 2}{0,5}\Rightarrow\\\\\Rightarrow R=\frac{52-1}{0,5}\Rightarrow R=\frac{51}{0,5}\Rightarrow\mathbf{R=102~\Omega}$