Question

Answer 1

1/ Dien tro ko dang ke, thi chap C voi D

Ta co: \(\left(R_3//R_1\right)nt\left(R_2//R_4\right)\)

\(\Rightarrow R_{td}=\dfrac{R_3.R_1}{R_3+R_1}+\dfrac{R_2.R_4}{R_2+R_4}=\dfrac{8.12}{8+12}+\dfrac{8.12}{8+12}=9,6\left(\Omega\right)\)

\(\Rightarrow I=I_{13}=I_{24}=\dfrac{U}{R_{td}}=\dfrac{12}{9,6}=1,25\left(A\right)\)

\(\Rightarrow U_3=U_{13}=I_{13}.R_{13}=1,25.\dfrac{8.12}{8+12}=6\left(V\right)\Rightarrow I_3=\dfrac{U_3}{R_3}=\dfrac{6}{8}=0,75\left(A\right)\)

\(\Rightarrow U_2=U_{24}=6\left(V\right)\Rightarrow I_2=\dfrac{U_2}{R_2}=\dfrac{6}{8}=0,75\left(A\right)\)

\(\Rightarrow I_A=0\left(A\right)?\)

Cái gì vậy :D???