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a/\(R_D=\dfrac{U^2}{P}=\dfrac{5,5^2}{4}=\dfrac{121}{16}\left(\Omega\right)\)
\(\Rightarrow R_{mach-ngoai}=\dfrac{\left(R_1+R_D\right).R_2}{R_1+R_D+R_2}=...\left(\Omega\right)\)
\(I=\dfrac{\xi}{R_{mach-ngoai}+r}=\dfrac{12,5}{0,5+R_{mach-ngoai}}=...\left(A\right)\)
b/ \(U_{mach-ngoai}=U_{1D}=U_2=I.R_{mach-ngoai}=...\left(V\right)\)
\(\Rightarrow I_D=I_1=\dfrac{U_{1D}}{R_D+R_1}=...\left(A\right)\)
\(I_{Den-dinh-muc}=\dfrac{P}{U}=\dfrac{4}{5,5}=\dfrac{8}{11}\left(A\right)\)
\(\left[{}\begin{matrix}I_D>I_{Den-dinh-muc}\Rightarrow den-sang-yeu-hon-binh-thuong\\I_D< I_{Den-dinh-muc}\Rightarrow den-sang-manh-hon-binh-thuong\\I_D=I_{Den-dinh-muc}\Rightarrow den-sang-binh-thuong\end{matrix}\right.\)
\(\xi=\xi_1+\xi_2=12+12=24V\)
\(r=n\cdot r=2\cdot0,5=1\Omega\)
\(R_Đ=\dfrac{U_Đ^2}{P_Đ}=\dfrac{6^2}{9}=4\Omega\)
\(R_{3Đ}=R_3+R_Đ=6+4=10\Omega\)
\(R_N=\dfrac{R_1\cdot R_{3Đ}}{R_1+R_{3Đ}}=\dfrac{10\cdot10}{10+10}=5\Omega\)
\(I=\dfrac{\xi}{r+R_N}=\dfrac{24}{1+5}=4A\)
