Theo định luật ôm: \(I=\dfrac{U}{R}\Rightarrow U=I.R\)
\(\Rightarrow U_1=I_1R_1\)
\(U_2=I_2R_2\)
\(\Rightarrow\dfrac{U_1}{U_2}=\dfrac{I_1R_1}{I_2R_2}\)
mà \(R_1ntR_2\Rightarrow I_1=I_2\)
\(\Rightarrow\dfrac{U_1}{U_2}=\dfrac{R_1}{R_2}\Rightarrow dpcm\)
MONG ĐÁNH CTLHN