, , . , . , , - . .
(. 5.1, ) (. 5.1,6) . , .
, . I = I = 50 . , 62.
, In = Ia + I = 100 . 16 2. (. 5.1, ) 46= 24 2, (. 5.1,6) 26+16 = 28 2, . . . , . , ( ).
. 5.2 , 180 I I B.
IA=IB, IN = 0. IN . , . . .
(. 5.3)
. (I = I = I ), .
(IA=IB=IC) , EB, 120 (. 5.4) , IN = Ia + IB + Ic = 0. (IA ≠IB ≠ Ic), (. 5.5).
, , , 120, . - .
: 1) , , ; ; 2) , ; 3) ( ), .