()

, , , .

.

, .

, , , .

.

:

U = 56

R1=R2=40

R3 = 35

R4 = 10

R5 = 50

: I1-5=?

1) .

I=IA

U = I∙R = 2∙24 = 48

2) , R5 ;

3) , , .

0 = I2∙R2 - I3∙R3 + I5∙R5

I2∙R2 - I3∙R3 = - I5∙R5 0,3∙40-1,2∙35 = -I5∙50

32 - 84 = -I5∙50 I5 = 0,2A

3) I1 I4 , .

I1 + I5 - I2 = 0 (B)

I1 = I2 - I5

I1 = 0,8 - 0,2 = 0,6A

I5 + I3 + I4 = 0 (C)

I4 = I3 + I5

I4 = 1,2 + 0,2 = 1,4A

:

U =200

R1 = 10

R2 = 70

R3 = 20

R4 = 130

R5 = 30

R6 = 10

: I1-6, - ?

R4B = RB + R4 = 2 + 130 = 132

RC5 = RC + R5 = 14 + 30 = 44

R = 33 + 10 + 7 = 50

I=I6=4A

U = I∙R = 4∙33 = 132

0 = -I3∙R3 + I4∙R4 - I5∙R5

I3∙R3 = I4∙R4 - I5∙R5

I3∙20 = - 1∙130-3∙30

I3∙20 = 40

I3 = 2A

() I1 - I3 - I4 = 0

I1 = I4 + I5 = 1 + 2 = 3A

(C) I2 + I3 - I5 = 0

I2 = I5 - I3 = 3 - 2 = 1A

     


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