Question

Answer 1

R8 nt {R7//{R5 nt R6nt{(R1 ntR2)//(R3 nt R4)}}

\(=>Rtd=R8+\dfrac{R7\left\{R5+R6+\dfrac{\left(R1+R2\right)\left(R3+R4\right)}{R1+R2+R3+R4}\right\}}{R7+R5+R6+\dfrac{\left(R1+R2\right)\left(R3+R4\right)}{R1+R2+R3+R4}}=16\Omega\)

\(=>I1=I12=1A=>U12=U1234=I12.R12=\left(R1+R2\right)=12V\)

\(=>I1234=\dfrac{U1234}{R5+R6+\dfrac{\left(R1+R2\right)\left(R3+R4\right)}{R1+R2+R3+R4}}=1A=I5=I6=I123456\)

\(=>U1234567=U7=1.R1234567=Rtd-R8=6V=>I7=\dfrac{6}{12}=0,5A=>Im=0,5+1=1,5A=>Uab=Im.Rtd=16.1,5=24V\)

(bấm máy tính lại ktra cho chắc nhé)