Lời giải

Ta có: \(\left\{ \begin{array}{l}{N_1} = 2{N_2}\\\frac{{{N_1}}}{{{N_2}}} = \frac{{{U_1}}}{{{U_2}}} = \frac{{{I_2}}}{{{I_1}}}\end{array} \right.\)\( \Leftrightarrow \frac{{2{N_2}}}{{{N_2}}} = \frac{{220}}{{{U_2}}} = \frac{{{I_2}}}{1} \Rightarrow \left\{ \begin{array}{l}{U_2} = 110\left( V \right)\\{I_2} = 2\left( A \right)\end{array} \right.\)

Đáp án đúng: D