Question

Làm giúp mình với 

Answer 1

1. Tìm R₁:

\(U_{23}=U_2=U_3=I_2\cdot R_2=2\cdot6=12V\left(R_2\backslash\backslash R_3\right)\)

\(I=I_1=I_{23}=\dfrac{U_{23}}{R_{23}}=\dfrac{12}{\dfrac{6.3}{6+3}}=6A\left(R_1ntR_{23}\right)\)

\(\Rightarrow R_1=\dfrac{U_1}{I_1}=\dfrac{\left(18-12\right)}{6}=1\Omega\)

Answer 2

2. Tìm R₃:

\(U_{23}=U_2=U_3=I_2\cdot R_2=2.1=2V\left(R_2\backslash\backslash R_3\right)\)

\(U_1=U-U_{23}=18-2=16V\)

\(\rightarrow I=I_1=I_{23}=\dfrac{U_1}{R_1}=\dfrac{16}{3}=\dfrac{16}{3}A\left(R_1ntR_{23}\right)\)

\(\rightarrow I_3=I_{23}-I_2=\dfrac{16}{3}-2=\dfrac{10}{3}A\)

\(\Rightarrow R_3=\dfrac{U_3}{I_3}=\dfrac{2}{\dfrac{10}{3}}=0,6\Omega\)