C

A

B

A

A

C

C

\(MCD:\left(R_dntR1\right)//R2\)

\(->R_d=\dfrac{U_d^2}{P_d}=\dfrac{6^2}{3}=12\Omega\)

\(->R_{td}=\dfrac{\left(R_d+R1\right)\cdot R2}{R_d+R1+R2}=\dfrac{\left(12+6\right)\cdot6}{12+6+6}=4,5\Omega\)

\(->I=\dfrac{U}{R}=\dfrac{13,5}{4,5}=3A\)

\(->I_d=I1=\dfrac{P_d}{U_d}=\dfrac{3}{6}=0,5A\)

\(->I2=I-I_d1=3-0,5=2,5A\)

\(I_{AB}=I=3A\)

\(\left\{{}\begin{matrix}P_d=3\\P1=I1^2\cdot R1=0,5^2\cdot6=1,5\\P2=I2^2\cdot R2=2,5^2\cdot6=37,5\\P_{AB}=UI=13,5\cdot3=40,5\end{matrix}\right.\)(W)

Ta có: \(A//R1\)

\(=>U_A=U1=I1\cdot R1=0,5\cdot6=3V\)

\(=>I_A=\dfrac{U_A}{R_A}=\dfrac{3}{0}\) (vô lý)

mik gửi cho  bạn 4 mẫu rui đấy

Câu 5:

a,C1:

còn câu b , thì mk chx đc hiểu cho lắm!