, , , (). U.
. 5.2 (. 5.6). , θ=900 θ=1800. θ=1800 ... 50% , , . , .. .
; η < 0,5, > 1
θ=900.
() 7.14. , . θ=900 (I) (I1). U = I1 R, I1=f(U).
7.14
= I I, .
1= 0,5I12 R U . = - 1 .
... θ=900, γ(θ)- . , ... U.
, ( ). , ....
.
= I. I, , I, m,
= Iҷ = (. 7.15).
7.15
= 1(1+0,52) = 1ҷ0,52.
7.15.