Question

Giúp em với ạ em cảm ơn

Answer 1

CTM: \(\left[R_3nt\left(R_1//\left(R_2ntR_4\right)\right)\right]\)

\(R_{24}=2+2=4\Omega\)

\(R_{124}=\dfrac{R_1\cdot R_{24}}{R_1+R_{24}}=\dfrac{2\cdot4}{2+4}=\dfrac{4}{3}\Omega\)

\(R_{tđ}=R_3+R_{124}=2+\dfrac{4}{3}=\dfrac{10}{3}\Omega\)

\(R_{mạch}=R_{tđ}+r=\dfrac{10}{3}+1=\dfrac{13}{3}\Omega\)

\(I_A=I_{mạch}=\dfrac{\xi}{R_{mạch}}=\dfrac{6,9}{\dfrac{13}{3}}=1,59A\)