Question

giải hộ em với ạ, em cảm ơn

 

Answer 1

\(R_1nt\left(R_2//R_3\right)\)

a)\(R_{23}=\dfrac{R_2\cdot R_3}{R_2+R_3}=\dfrac{20\cdot20}{20+20}=10\Omega\)

   \(R_m=R_1+R_{23}=10+10=20\Omega\)

b)\(I_m=I_{23}=I_1=0,4A\)

   \(U_1=R_1\cdot I_1=10\cdot0,4=4V\)

   \(U_{23}=R_{23}\cdot I_{23}=10\cdot0,4=4V\)

   Có \(R_2//R_3\Rightarrow U_2=U_3=U_{23}=4V\)

Answer 2

\(R_m=R_1+\dfrac{R_2.R_3}{R_2+R_3}=10+\dfrac{20.20}{20+20}=20\left(\Omega\right)\)

\(I=I_1=I_{23}=0,4\left(A\right)\)

\(U_1=I_1.R_1=0,4.10=4\left(V\right)\)

\(U_{23}=U_2=U_3=I_{23}.R_{23}=0,4.\dfrac{20.20}{20+20}=4\left(V\right)\)