Question

Mọi người giúp em với, em đang cần gấp lắm

Answer 1

\(1.\Rightarrow R1//R2\)

\(\Rightarrow U2=U1=\left(I-I2\right).R1=4,8V\Rightarrow R2=\dfrac{U2}{I2}=\dfrac{4,8}{0,4}=12\Omega\)

\(b,\Rightarrow U=U1=4,8V\)

\(c,R1//R2//R3\Rightarrow I3=I-1,2=0,3A\Rightarrow R3=\dfrac{4,8}{I3}=16\Omega\)

\(\Rightarrow Rtd=\dfrac{U}{I}=\dfrac{4,8}{1,5}=3,2\Omega\)

\(2.\left(R1ntR2\right)//R3\)

\(\Rightarrow Rtd=\dfrac{R3\left(R1+R2\right)}{R3+R1+R2}=5\Omega\)

\(b,\Rightarrow\left\{{}\begin{matrix}Im=\dfrac{U}{Rtd}=2A\\I3=\dfrac{U}{R3}=1A\\I1=I2=Im-I3=1A\\\end{matrix}\right.\)

\(c,\Rightarrow\left\{{}\begin{matrix}U3=U=10V\\U1=I1.R1=4V\\U2=10-4=6V\end{matrix}\right.\)