Ta có: \( \dfrac{U_1}{U_2}= \dfrac{I_1}{I_2} \Rightarrow \dfrac{U_1}{U_1+10,8}=\dfrac{I_1}{I_2}\)
\( \Rightarrow \dfrac{7,2}{7,2+10,8}=\dfrac{I_1}{I_2}\Rightarrow\dfrac{I_1}{I_2}=\dfrac{2}{5}\Rightarrow I_2=2,5I_1\)
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