, . , (""), - ("").
"" ,
"" . , .
( ) ( ) . , , . , ( ). Umax Umax ( ). , . Umin, . Umin Umax "" , .
1. , ?
, .
1
3 20 . 5 .
R = U / I
U = U U
U = 5
U = 3
I = 20 = 0.02
R =(5-3)/0.02= 100 = 0.1
, 100
P.S. on-line
2. ?
, .
1.
3 20 . 3 15 .
: 3 3 = 9 , 15
R = U / I
U = U N * U
U = 15
U = 3
I = 20 = 0.02
R = (15-3*3)/0.02 = 300 = 0.3
2.
3 20 . 4 7
: 4 3 = 12 , , -. 2 . . .
|
|
R = U/I
U = U N * U
U = 7
U = 3
I = 20 = 0.02
R = (7-2*3)/0.02 = 50 = 0.05
, .
3.
, ( ). ,
5 :
1- 3 20
2- 2.5 20
3- 3 50
4- 2.7 50
5- 3.5 30
1) 1- 2-
2) 3- 4-
3) 5-
:
R = U/I
U = U (UY + UX + )
U = 7
U1 = 3
U2 = 2.5
I = 20 = 0.02
R1 = (7-(3+2.5))/0.02 = 75 = 0.075
R2 = 26
R3 = 117
!!!
, .
3. 3 ( ) 3 ?
( ) . . dc-dc ( ).
4. 3 3 ( )? .
, . : , , , , , . dc-dc ( ).