Izmjeni na struja
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Izmjenična struja. B. a. v. b. v. c. d. B. b. v. c. a. v. d. B. b. I. v. a. c. v. d. I. B. c. v. 2r. I. v. a. l. I.  i = B2l  r sin  t. B. , 2rl = S. v.  i = B S  sin  t. .  i  u. r. . U o = BS . Maksimalna vrijednost

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PowerPoint Slideshow about ' Izmjenična struja' - mitchell-jeremiah


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B

a

v

b

v

c

d

B

b

v

c

a

v

d

B

b

I

v

a

c

v

d

I

B

c

v

2r

I

v

a

l

I


i= B2l r sin t

B

, 2rl = S

v

i= BSsin t

i  u

r

Uo = BS

Maksimalna vrijednost

izmjeničnog napona

u = Uo sin t

Jednadžba

izmj. nap.

i = Blv sin

i = Iosin t

Jednadžba

izmj. str.

v =  r

 =  t

,  = 2f

l  2l


u,i

t

u

Uo

Io

T

i


u

t

Zadatak: Frekvencija gradske mreže je 50 Hz. Koliko puta

u svakoj sekundi napon ima vrijednost 0? Za koje vrijeme

napon gradske mreže naraste od nule do maksimalne

vrijednosti?

Rješenje:

f = 50 Hz

Uo

N = 2 f

= 250 Hz

T

t

N =100 puta u sekundi

, t =0,005 s

=5 ms