Объяснение:
U4=IR=1*1=1 В ==U5=U6, I5=I6= 1A, I456=3A= I23= I1,
R23=1/2 Ом, U2=U3=I23*R23= 1.5 В,
U1=I1*R1= 3*1= 3B, U=U1+U2+U4= 5.5B =U7,
I7=5.5/1=5.5 A, Iобщ=I1+I7= 8.5A, Rобщ=U/Iобщ= 5.5/8.5= 0.647 Ом
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Объяснение:
U4=IR=1*1=1 В ==U5=U6, I5=I6= 1A, I456=3A= I23= I1,
R23=1/2 Ом, U2=U3=I23*R23= 1.5 В,
U1=I1*R1= 3*1= 3B, U=U1+U2+U4= 5.5B =U7,
I7=5.5/1=5.5 A, Iобщ=I1+I7= 8.5A, Rобщ=U/Iобщ= 5.5/8.5= 0.647 Ом