Question

các anh chị giải giúp em ạ.

Answer 1

\(MCD:R_1//\left(R_2ntR_3\right)\)

\(\Rightarrow R=\dfrac{R_1\left(R_2+R_3\right)}{R_1+R_2+R_3}=\dfrac{6\left(2+4\right)}{6+2+4}=3\Omega\)

\(\Rightarrow U=IR=2\cdot3=6V\)

\(U=U_1=U_{23}=6V\Rightarrow\left\{{}\begin{matrix}I_1=\dfrac{U_1}{R_1}=\dfrac{6}{6}=1A\\I_{23}=\dfrac{U_{23}}{R_{23}}=\dfrac{6}{6}=1A\\I_2=I_3=I_{23}=1A\end{matrix}\right.\)

\(\Rightarrow\left\{{}\begin{matrix}P_1=U_1I_1=6\cdot1=6\\P_2=U_2I_2=I_2^2R_2=1^2\cdot2=2\\P_3=U_3I_3=I_3^3R_3=1^24=4\end{matrix}\right.\)(W)

Answer 2