^hdn tick vd hucang ddn gidi
Ap dung cong thuc may bien the cho cupn so cap voi cupn thu cap thu nhat: So vong cupn thu cap thu nhat:
N2 U 2
^, N j U j 1320.10 . • N , = ^ = — r r : : — = 60 vong
220
A p dung cong thuc may bien the cho cupn so cap vdi cupn thu cap thu hai: Hi^u difn the cupn thu cap thu hai: N , U Hi^u difn the cupn thu cap thu hai: N , U
N 3 U U ^ ^ 2 2 a 3 6 ^ ^ ^ ^ N, Ta c6: = + P3 =:> I j U j = I j U j + I 3 U 3 =>l^ = Chpn dap an B 3 '^i 6.1,2 + 10.0,5 220 1320 = 0,055A
Vl du 7: Dat vao hai dau cupn so cap ciia mpt may bien ap h' tuong mpt di?n ap xoay chieu c6 gia trj khong doi thi hi?u difn the hipu dung giira hai dau mach thu cap khi de ho la lOOV. Neu tang them n vong day 6 cupn so cap thi hi^u di?n thehi^u dung giCra hai dau cupn thu cap khi de ho la U ; neu giam bot n vong day 6 cupn so cap thi hi|u difn the hieu dung giua hai dau mach thu cap khi de ho la 2U. Neu tang them 2n vong day 0 cupn thii cap thi hi^u di^n the hi§u dung giiia hai dau cupn thu cap CO the la
A. 50V. B.IOOV C.60V D . 120V
^hdn tich m hu&ng ddn gidi
Gpi dien ap hipu dung dat vao cupn so cap la U i , so vong day cupn so cap va thu cap la N i va N 2
Theo bai ra ta c6:
Ban dau:
100 N 2
Cty TNHHMTVDX VII Kluui^^ V,rt
(1)
Khi tang them n vong day 6 cupn so cap: — = ""^"
U N 2
Khi giam bot n vong day 6 cupn so cap: - ~ "
2 U N .