chac la mach song song vi thay ban dang bai doan mach song song
=>R1//R2
\(\Rightarrow Rtd=\dfrac{R1R2}{R1+R2}=\dfrac{4.12}{4+12}=3\Omega\)
\(\Rightarrow U1=U2=Ia.Rtd=0,5.3=1,5V\Rightarrow\left\{{}\begin{matrix}I1=\dfrac{U1}{R1}=0,375A\\I2=Ia-I1=0,125A\end{matrix}\right.\)