^ u , - i i - r , ^ N i _ U2 + i 2 . r 2 N2 ^ ' K h i r, r2 « 0 ( h a y r, * 0 , m a c h t h u cap h o ) t h i ta c6: ', .•* , e ^ _ E j _ _ L J ^ _ N ^ _ ' ^ i ' ' e 2 = E 2 = U 2 = N 2 = ' V o i k la h e so m a y b i c h a p "' •'* - N e u k > 1 => U i > U2 = > m a y h a a p > • ,^ - N e u k < 1 = > U i < U2 =^ m a y t a n g a p " • 2) C o n g s u a t c u a m a y b i e n t h e : - C o n g s u a t c u a c u o n s o cap: P i = Uilicoscp, - C o n g s u a t cua c u o n t h u cap: P2 = U2l:cos(p2
3) H i e u s u a t cua m a v b i e n t h e : f-j 1^ ^ U T I J cos(p2 f-j 1^ ^ U T I J cos(p2 P| U11| cos(f)| + N e u H = 1 t h i ta c6: Hi = ll = III ^ i l U2 I , N2 E, m V i D U MAU: Vi d u 1: M o t m a y b i e n a p l i t u o i i g c6 hai c u o n d a y I a n l u g t la lOOOOvong va 2 0 0 v 6 n g . M u o n t a n g a p t h i c u o n n a o la c u o n s o c a p ? N e u d a t v a o c u o n s o c a p d i e n a p h i e u d u n g U i = 2 2 0 V t h i d i e n a p h i e u d u n g 6 c u o n t h u c a p b a n g b a o n h i e u ? A . N , = 2 0 0 v o n g ; N , = 1 0 0 0 0 v o n g ; = n O O O V B. N , = 1 0 0 0 0 v 6 n g ; N2 = 2 0 0 v o n g ; = 2 2 0 V C. N , = 2 0 0 v 6 n g ; N ^ = 1 0 0 0 0 v o n g ; = 1 0 0 0 0 V D . N , = 1 0 0 0 0 v o n g ; N j = 2 0 0 v o n g ; U 2 = 1 1 0 0 0 V
^hdn tich m hu&ng cldn gidi
D e la m n \ t a n g a p t h i so v o n g c u p n t h u c a p p h a i I o n h o n c u o n s o c a p v i t h e n e u N , la so v o n g d a y c u o n s o c a p v a N j la so v o n g d a y c u o n t h u c a p t h i : n e u N , la so v o n g d a y c u o n s o c a p v a N j la so v o n g d a y c u o n t h u c a p t h i : N i = 200 v o n g , N 2 = 10000 v o n g
A p d u n g c o n g t h u c ciia m a y bien a p d e t i n h d i e n a p h i e u d u n g 6 c u o n t h u cap:
i
U , N , N j 2 0 0
(„/.
Vl d y 2 : C u g n t h i i cap cua m a y bien the'co lOOOvong. T u t h o n g xoay chieu t r o n g l o i b i e n the c6 tan so' 50Hz va gia t r i cue dai 0 , 5 m W b . Sua't di§n d o n g h i e u d u n g ciia cuQn t h u cap la:
A . I I I V . B. 157V C.500V. D . 353,6V.
^hdn tick vd hitcmg dan gidi
Doc xong decac ban se thay c6 cdi gi do hai la vi bai loan chi hoi rieng a cuon thu cap, bai todn Id dip decdc ban hieu mot dieu: suat dien dong giita hai dau cuon thu cap vd hieu dim the hai dau cuon thu cap. Trong bdi ndy hai dai lucmg tren la giong nhau vi tren cuon thu cap khong c6 tdi tieu thu.
^ . . . . . „ EQ NCOOQ lOOO.lOOTt.aS.lO-^
T h e o b a i ra ta co: E = —^ = — j = ^ = ^= = 111V
\j2 v 2 v 2
C h p n dap an A .
Vl d u 3 : MQt m a y bien t h e ' d i i n g t r o n g may t h u v 6 t u y e n c6 c u p n so cap g o m 1000 v o n g , mac vao m a n g d i ^ n 127V va ba cupn t h u cap de lay ra cac hi#u d i ^ n the 6,35V; 15V; 18,5V. So v o n g day cua m o i c u g n t h i i cap
Ian lugt la:
A . 71v6ng, 167v6ng, 207v6ng B. 71v6ng, 167v6ng, 146v6ng C. SOvong, l l S v o n g , 146v6ng D . 71 v o n g , l l S v o n g , 207v6ng
'Phdn tick m hu&ng dan gidi
Day la bdi todn may bien the'co mot cuon sa cap nhung Iqi co ba cuon thu cap, bdi todn duac gidi quyei tuan tu thai khong co gi kho khan cd. Chi can dp dung cong thuc may bien thevd sau do tinh cho timg cuon thu cap la c6 ngay ddp dn.
A p d u n g cong t h u c m a y bien the:
^ = ^ = • ^ • U 2 T h a y so vao t u n g t r u o n g h g p :
C u g n t h i i cap t h u nhat: = •^•^21 = ^ ^ . 6 , 3 5 = 5 0 v o n g
N 1000
C u p n t h u cap t h u hai: = "~"-U22 = -15 =118 v o n g
N 1000 CuQn t h u cap t h u ba: N23 = — - ^ 2 i ^ .18.5=146 v o n g CuQn t h u cap t h u ba: N23 = — - ^ 2 i ^ .18.5=146 v o n g
U | 127 C h p n dap an C ^ C h p n dap an C ^
Vl d u 4 : C u o n so cap cua m a y b i e n ap mac qua ampe ke vao d i f n ap xoay
chieu CO gia t r j h i f u d u n g lOOV t h i ampe ke chi 0,0125A. Biet c u p n t h i i
cap mac vao m a c h g o m m p t n a m cham d i ^ n co r = I Q v a m p t d i ^ n Xxb (adsbygoogle = window.adsbygoogle || []).push({});
t rv ir^'lU! MIV IJVVH Kluing Vift\
R - 9 n . T i so giua v o n g day cuon so cap va cuon t h u cap bSng 20. Bo qua hao p h i . D p lech pha giua c u a n g dp dong d i ^ n va dien ap a cupn t h u cap la?
A- B. -71/4. C. 71/2. D . 7t/3
_ ' '
'Phdn tich vd hucang dan gidi
T h e o b a i r a t a c o : ^ = HL = 20=> U 2 = H I . = M = 5V.
N2 U2 20 20
M a t khac, bo qua hao p h i : ^ = =>I2 = H i .= 0,0125 = 0,25A .
U2 I j U2 5
M?ich t h u cap co tai nen t o n g t r o cupn t h u cap: Z = ^ 2 . = ^ = 20Ci .
I2 0,25
M a Z = ^ ( R + r f Z ^ Z L =^z2-(R + r f =^20^-{9 + lf =10^/3n
D p lech pha gii>a c u o n g dp d o n g di?n va h i ^ u d i ^ n the 0 c u p n t h u cap:
Z L loVi fz n
C h p n dap an D