E R 0. () , .. I, U, P=U I, h =P/P 0.
( ); .
-.
R :
(1)
IR=U,
U=E- IR 0. (2)
, IR0 ( ). U=IR (1),
(3)
, , . , ( ),
(4)
C (1), :
(5)
P 0 =IE=I 2 R+I 2 R 0=
(6)
h , , (4) (6),
(7)
(8)
(1), (3), (5), (6) (8), , .
, , .
(5) R ,
,
R=R 0. (9)
, , .
, , , , . / 2 R 0, .. ,
max= 2 / 4 R 0.
, . : (R= ¥), (R=R 0) (R= 0).
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, . ( , ) .