Question

mng giúp em bài này gấp với ạ

Answer 1

=>R1 nt(R2//R3)

\(=>Rtd=R1+\dfrac{R2R3}{R2+R3}=12+\dfrac{8.24}{8+24}=18\Omega\)

\(=>U23=U2=U3=0,4.R23=0,4.\dfrac{8.24}{8+24}=2,4V=>I2=\dfrac{U2}{R2}=\dfrac{2,4}{8}=\dfrac{3}{10}A=>I3=0,4-\dfrac{3}{10}=0,1A\)

\(=>Um=ImRt=0,4.18=7,2V=>U1=U-U12=7,2-2,4=4,8V\)