. , . . , .
.
35 (. 8.1). .
( ). , ( - ) .
, . (. 8.2). U 2. . φ 2 I 2. I 2 I 2 :
U 2 I 2 . b. 900 . c. c U 1. U 1 I 2 φ 1.
. . . d. ad . . d . .
. . f. , k. :
ae = abcos φ2 = I2R cos φ2; be = df = absin φ2 = I2R sin φ2;
ed = bf =bcsin φ2 = I2X sin φ2; cf = bccos φ2 = I2X cos φ2.
:
Δ U = ad = ae + ed = I2R cos φ2 + I2X sin φ2.
:
Δ U = cf df = I2X cos φ2 I2R sin φ2.