Question

giúp mình bài 1a , tks ạ 

Answer 1

Bài 1:

\(R=R1+R2=30+80=110\Omega\)

\(I=I1=I2=U:R=110:110=1A\left(R1ntR2\right)\)

\(\left\{{}\begin{matrix}U1=R1.I1=30.1=30V\\U2=R2.I2=80.1=80V\end{matrix}\right.\)

Bài 2:

a. \(R=R1+R2+R3=4+4+4=12\Omega\)

b. \(R=\dfrac{\left(R1+R2\right)R3}{R1+R2+R3}=\dfrac{\left(4+4\right)4}{4+4+4}=\dfrac{8}{3}\Omega\)

Answer 2

Sơ đồ mạch điện 1a: