4. , .
: , .
, .4.1 , , , , :
(4.1)
:
.4.1. , .
R . XL 90, XC 90. , . . 4.2 . 4.1 X XL.
.4.2 R,L,C: ) XL>XC; ) XL=XC; ) XL<\XC.
. , . 90 . , , , 90 . - , . , , j . j . , , .. , .
:
.
, (4.3)
.
(4.4)
(4.5)
XL > XC, UL > UC j . E XL < XC, UL < UC j . XL = XC, UL = UC. , j = 0, cos j = 1 .
UL = U. , xL = xC wL = 1/ wC. . X = XL - XC = 0 . Z R. I ax = U / R.
|
|
. , . .
, L (), () (). :
(4.6)
, Q :
(4.7)
; (6.8)
, , .
L . xC xL . . .
, XL = XC >> R ( Q), UC = UL >> U, , -
, R - L. UK UL, UK, U = U R + U L :
(4.9)
1. 4.1. ( =0). XL. .4.3. .
2. . . 9 : 4 , 4 . 4.1.
3. , .
4.1
/ | ||||||||||||
U | I | UK | UC | P | R | ZK | XL | XC | Z | UL | cosj | |
- | ||||||||||||
: ; ; ,
Imax ;
; ; ; .
.4.3. 4.1. , R,L,C, , . φ>0.
|
|
. , . , . , , 4.2. ( =0) (.4.4).
.4.4. 4.2. , R,L,C, , . φ>0.
4. 4.2 ( ), ;
4.2
C | Q | |||
_ | ||||
5 : XL > XC ; XL = XC; XL < XC.
:
UR = RI; UL = XLI; UC = XCI; U = U R + U L; U = U + U R + U L.
6 I; UL; UC; cos j; P; Z = f XL).
.
7 .
1. .
2. .
3. Z R, L, C. Z ?
4. Z 0 ¥ w = const C = const?
5. UC; UL; I = f (XL).
6. R ?
7. UL U?
8. , UK; U; U?
9. :
) ; ) ; ) .
10. ?
.4.5. R, L, C.
12. . 4.5. : U = 50 B, U = 20 B, UR = 30 B. UL.
13. UR, UL, UC I (.4.5), U = 220 B, R = 22 , XL = 200 .
14. (.4.6) . : U =30, U =40 . U V ?
.4.6. R, L, C.