7/23/2019 Formule Si Marimi Electrice

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Formule uzuale

Marimea electrica c.c.

c.a.

monofazat trifazat

rezistiv inductiv rezistiv inductiv

Intensitate I [A]

U/R U/R U/Rcos

P/3 U P/3 U cosP/U P/U P/Ucos

Tensiunea [V]

RI RI RI cos

P/3 I P/3 I cosP/I P/I P/Icos

2RI 2RI 2RIcos 3 RI 3 RI cos

UI UI 3 UI 3 UI cos

- - -

- -

P t = UI t P t = UI t UI cost 3 UIt 3 UI cost

- - -

R = /s sau /s

1 k = 1!3" #P

1 #P = $3" = $% k& '/s

1 k&'/s = (!)1

1 * = 1 +s = ,!2 ca. 1 k0 = 3",, k* = )", kca.

#aeea e tensiuneU [V]

Puteea acti4a P

[]

UI cos

5 cosPuteea eacti4a 6[VAR]

UI sinP t&

3 UI sinP t&

Puteea a7aenta 5[VA]

UIP8 9 68

3 UIP8 9 68

:ne&ie acti4a a

[0]

:ne&ie eacti4a

[VAR0]UI sin tP t& t

3 UI sin tP t& t

R2= R1[19(t2-t1)]

;ca.? 1 ca. = !1)$ *

7/23/2019 Formule Si Marimi Electrice

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MARIMI ELECTRICE

Nr. Marimea electrica Simbol Unitatea de masura Simbol U.M.

1 #uent e.ectic >intensitate? I A'7e A

2 5acina e.ectica 6 #ou.o'@ #

3 Tensiune >ie! e 7otentia.? U Vo.t V

Bota e.ecto'otoae : Vo.t V

% ReCistenta e.ectica R D0' E

" Reactanta ; D0' E

$ I'7eanta D0' E

) #onuctanta F = 1/R 5ie'ens 5

( #a7acitate # Baa B

1, :ne&ie e.ectica acti4a a attoa 0

11 :ne&ie e.ectica eacti4a Vo.t a'7e eacti4 oa VAR0

12 Putee e.ectica acti4a P att

13 Putee e.ectica eacti4a 6 Vo.t a'7e eacti4 VAR

1 Putee e.ectica a7aenta 5 Vo.t a'7e VA

1% Bec4enta GetC GC

1" Bacto e 7utee Hu'a 1$ Rana'ent Hu'a

1) Inuctanta < GenJ G

1( Inuctie 'a&netica K Tes.a T

2, B.uL e inuctie 'a&netica M e@e @

cos