Question

Mình cần gấp lắm ạ

Answer 1

R3 nt(R1//R2)(kq xau qua)

a,\(\Rightarrow Rtd=R3+\dfrac{R1R2}{R1+R2}=\dfrac{550}{3}\Omega\)

b,\(\Rightarrow I3=I12=\dfrac{Uab}{Rtd}=\dfrac{9}{\dfrac{550}{3}}=\dfrac{27}{550}A\)

\(\Rightarrow U12=Uab-U3=9-I3R3=\dfrac{18}{11}V=U1=U2\Rightarrow\left\{{}\begin{matrix}I1=\dfrac{U1}{R1}=\dfrac{9}{275}A\\I2=\dfrac{U2}{R2}=\dfrac{9}{550}A\end{matrix}\right.\)

c,\(\Rightarrow\left\{{}\begin{matrix}U1=U2=U12=\dfrac{18}{11}V\\U3=I3R3=\dfrac{81}{11}V\end{matrix}\right.\)