, .
( ) . , . : ( 1 ) .
. 1.17 Δ . . 1.17 i (t), , α(t). . Δ , i (t) .
, .
.1.17.
.1.18.
, , . () , ( , ) .
. ( Δ t) U I, (. 1.18).
, t 1 U (t 1)= 220 . , 1 , t 2 I (t 2) = 3,0 . ( ):
= U (t 1) I (t 2) = 220 3,0 = 660 .
, t 1 t 2 , :
(t 1) = U (t 1) I (t 2)= 220 3,3 = 726 ,
P P(t 2) = U (t 2) I (t 2)= 240 3,0 = 720 .
, (660 ) (726 720 ) 10%. , .
, Δ t.