Cấu tạo mạch như sau:
Theo hình vẽ ta có : \(\left\{\left[\left(\left(R_3//R_4\right)ntR_2\right)//R_5\right]ntR_1\right\}//R_6\)
Có hình vẽ như sau:
\(R_{34}=\dfrac{R_3\cdot R_4}{R_3+R_4}=\dfrac{1\cdot1}{1+1}=\dfrac{1}{2}\Omega\)
\(R_{234}=R_2+R_{34}=1,5+\dfrac{1}{2}=2\Omega\)
\(R_{2345}=\dfrac{R_{234}\cdot R_5}{R_{234}+R_5}=\dfrac{2\cdot1}{2+1}=\dfrac{2}{3}\Omega\)
\(R_{12345}=R_1+R_{2345}=\dfrac{1}{2}+\dfrac{2}{3}=\dfrac{7}{6}\Omega\)
\(I_{2345}=I_1=I_{12345}=\dfrac{5}{\dfrac{7}{6}}=\dfrac{30}{7}A\)
\(U_{2345}=\dfrac{30}{7}\cdot\dfrac{2}{3}=\dfrac{20}{7}V\)\(\Rightarrow U_{234}=\dfrac{20}{7}V\)
\(I_2=I_{234}=\dfrac{\dfrac{20}{7}}{2}=\dfrac{10}{7}A\)
