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28062
2010
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, . - ( ) , . . (). . R R . , , , . .
. 6 , R1 R2. . , , = 0,5...0,8 . R2 R1.
R. R = 0,1... 1 . . .
, , R R, , 180. , R, . , U0 = RI, R .
( ) - . . . , .
|
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( ) , , , . . , f> ∞, , . .
: f f . , 0,707 .
, | R, | Ku | R, | S | F, | F, | T, | T, | |
0,125 | 500 | 20 | -20 | +80 |
a) I=U/R
U=Ec*Ku=0,000125*90=0,01125 V
I=0,01125/400=0,000028125 = 0,028125
b)
:
P=I*U
P=0,000028125*0,01125=0,00000032
P = 8*ξ*P= 8*1,2*0,00000032 = 0,0000030375
c) I :
I =5*I = 0,000140625
d) U :
U=10*U = 0,1125
e)
= (0,5÷1,5)*Ku
= 1* 90 = 90
f)
f = 20 , f = 500 , = = 0,7
g) .
203
U | I | I0 | f | h11 | h12 10-3 | h21 | h22 | |||
339 | 0,5 | 0,05 |
1)
= 0,459
< 1 , , = 1 .
:
h21=KIk*h21(1mA) = 1*25
h12=KIk*h12(1mA) = 1*0,05*10-3
h11= KIk*h11(1mA) = 1*360
h22= KIk*h22(1mA) = 1*11