, .
. 5 20 . . . PV1 PA1 . ( , R R ). R: 1300 1 17 11 R . .. R ∞. ( ) PV2 PA2.
:
:
;
dU,%;
R;
h.
R
(R = const) :
(4.1)
U , U , V1 V2, .
R U - const (..∆U = 0)
(4.2)
∆U - , ∆I (∆I =I I min).
h:
(4.3)
()
(4.4)
, I I, . , (.., ), (5.4).