Question

Giúp Mình Với Ạ Huhu😿

Answer 1

Bài 2:

a. \(\dfrac{1}{R}=\dfrac{1}{R1}+\dfrac{1}{R2}+\dfrac{1}{R3}=\dfrac{1}{10}+\dfrac{1}{15}+\dfrac{1}{30}=\dfrac{1}{5}\Rightarrow R=5\left(\Omega\right)\)

b. \(U=U1=U2=U3=12V\)(R1//R2//R3)

\(\left\{{}\begin{matrix}I1=U1:R1=12:10=1,2A\\I2=U2:R2=12:15=0,8A\\I3=U3:R3=12:30=0,4A\end{matrix}\right.\)

Answer 2

Bài 1:

a. \(R=\dfrac{R1.R2}{R1+R2}=\dfrac{7,5.15}{7,5+15}=5\left(\Omega\right)\)

b. \(U=U1=U2=I1.R1=0,3.7,5=2,25V\)

\(\left\{{}\begin{matrix}I2=U2:R2=2,25:5=0,45A\\I=I1+I2=0,3+0,45=0,75A\end{matrix}\right.\)