() I = 15 U = 75 a = 150 .
:
1. r.
2. I, r ђI, I.
3. , I = 3,0 .
4. r.
5. u, r ђu, U = 60 .
6. , U = 60 .
.
.
. , .
, . , . r .
1 I = I + I
2 I × r = I × r
. . .
, , .
S. , .
I =I / α
:
u =U / α
1.
. . I, U.
, , .
I, , I :
;
r .
I n I, . . n = I / I. , I = I + I,
I = I n, IN n = I + I. , I = U / r I = U / r :
|
|
|
.
U, :
,
n .
2.
I =I / α = 15 / 150 = 0,1 /
,
n = I / I = 3 / 0,015 = 200
r = U / I = 75 / 15 = 5
r = 5 / 199 = 0,025
ђI I = 3,0
ђI =I / α = 3 / 150 = 0,02 /
3. , I = 3,0
P = I2 × r = 0,0152 × 5 = 0,001
4.
.
, . , , . . I r r :
U .
U r r n , I, , :
,
n r =r + r, r = r (n-1), n = U / U
5.
U =U / α = 75 / 150 = 0,5 /
r = r (n-1),
n = 60 / 0,075 = 800
r = U / I = 75 / 15 = 5
r = r (n-1) = 5 × 799 = 3995
ђU U = 60
ђU =U / α = 60 / 150 = 0,4 /
6. , U = 60
P = I2 × (r + r) = 0,0152 × (5 + 3995) = 0,9
