.
19. . . , , . , . . : I2R0(1+αӨ)=A(Ө-Ө ). - : I2R0 + Ө= Ө(- I2R0α) =>Ө= (I2R0+ Ө)/(- I2R0α) => 1 + αӨ = (1 + I2R0α + Ө)/ (A - I2R0α)= (A αӨ)/(1-(1 - I2R0α/A)). △P = I2R0(1+αӨ) = (I2R0(1+ αӨ))/(1-(I2R0α/A)). . . ... , . , 0. , . .. - I2R0α=0. I=√A/ R0α. . - . = (I2R0(1+ αӨ))/ Ө- Ө. I=I√(1+ αӨ)/ α(Ө-Ө). : α=0,004. Ө = 70. Ө=25. I=2,67 I.
20. . ,
;. = ;; . - . . . , . ; .
= ( U
( U .
21. . T- ( 1 ) . [ ] =360000.
10-15 % . . , . . : , , . , . , . . . , . . , . .
22. , . , ., . , . . 2 :3-x . - , -, z ; , . , . :
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= (U-const,
, . .( ) . , , , , . , . os
24.
,
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- , , / , / [] (3). . (1). (3)
, , (2), . . : , , .
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1. . , , , . 2. P-const, U-const, , . 3. U-const, const
. , .
4 . 1. . P-const, Q-const , , I=
. 2.
, .3 . Z-const , ( ) , . P= => = , = . R, P= R= , R= . = 4. . . , P(U) Q(U), . . .
K= - ,a b
.1-P-const 2.I-const 3 Z-const 4. P- const(A ) 5. Q-onst(. ). , % 1% . = ; =
, =23