. 5.14. . a: I 1 + + I x = I 2. R x ¥ I x = 0, I 1 = I 2. , f / R 1 = (f U x)/ R 2. f ¹ 0; f / R 2 + f / R 1 = U x/ R 2, . . f (R 2 + R 1)/ R 1 = U x, f = U x R 1/(R 1 + R 2). , U x = f ¹ ¥ U x = U x/ = 0, f = f+.
, I x = 0, R 3 , f = U x. U x = U x R 1/(R 1 + R 2), U x = U x(R 1 + R 2)/ R 1. , :
. 5.14 |
U x= U x(l + R 2/ R 1),
KU = l + R 2/ R 1.
, . 5.14 ( R 2/ R 1 R 2 = 0) , . , ( , ), U < 1 .
R 2 = 0 (. . ), R 1 ( R 1 ), . 5.15. R 2 R 1 KU , KU = 1 + 0/¥ = 1. , , . . 5.15 .
. 5.15 |
4.2 . , (, ). , . , .
5.25.4 . . , .
. 5.16 |
. 5.16. R 1 R 3 U x1 U x3. U x, , : ¥, R x ¥.
|
|
:
I 0 + I x = I 1 + I 2 + I 3.
, R x ¥, I x = 0, I 0 = I 1 + I 2 + I 3.
:
(f − U x)/ R 0 = (U x1 − f )/ R 1 + (U x2 − f )/ R 2 + (U x3 − f )/ R 3.
(f+ = 0) ¥ f 0,
− U x/ R 0 = U x1/ R 1 + U x2/ R 2 + U x3/ R 3,
. .
U x = −(U x1 R 0/ R 1 + U x2 R 0/ R 2 + U x3 R 0/ R 3).
R 0/ Ri -
U x i , KUi = R 0/ Ri. , ,
U x = −Σ U x i KUi.
.
, . . , (, R 0 = Ri). Ri, (. . Ui).