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, (, LED - light emitting diode)- , . p-n-. ( ) , p-n-.

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1. . / 100
2.
3.
4.



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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

2. ?

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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

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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



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: Sivent; : cxem.net

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