- , U ( ) I, .

. ().

U(I) I(U) - , , , - .

U=rI I=gU, I=U/r

(1)

r=1/g g=1/r - /= () /= ().

r , g - . , . r=r l/s , r , l s - , .

dc/s_dc_12.gif

, U=rI .1 . , , .. , , , . , .

() (. 1). , .. , .. ( ). , , .. .

.

, , R1=40 , R2=10 , R3=20 , R4=30 , R2 U2=2 . U .

R2: I2 = I3 = U2/R2 = 0.2 .

R2 R3 R23 = 10+20=30 .

U23 = I2R23 = 6 .

, R23 R4 : R234 = (R23R4)/( R23 + R4) =15 .

R234 R1 : I234 = I1 = I = U23 /R234 = 0.4 .

R234 R1 , .. : R = R234 +R1 = 15+40 = 55 .

, U = IR = 0.4 55 = 22


1


dc/s_dc_13.gif

, . .

ac (.2 )) a c :

Uac= j a-j c = (j a-j b)+(j b-j c) = Ur + UE =Ir + E

- I = (Uac - E)/r.

. 2 ), , , , , E

I = (Uac + E)/r.

, . 2

I = (Uac E)/r.

(2)

, .

(2) , . , (1) (2) E=0.


2



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