Question

Giúp mình câu này với

Answer 1

cđ dđ 

\(I_{12}=\dfrac{U}{R_{12}}=\dfrac{9}{180}=0,05\left(A\right)\)

\(I_{34}=\dfrac{U}{R_{34}}=\dfrac{9}{90}=0,1\left(A\right)\)

\(\Rightarrow U_{MN}=U_3-U_1=0,1.60-0,05.60=3\left(V\right)\)