Circuite RLC serie Flashcards

1
Q

Impendanta?

A

Reprezinta rezistenta totala a circuitelor in curent alternativ

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2
Q

tg φ

A

Xl-Xc/R sau Ul-Uc/R

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3
Q

Legea lui ohm in curent alternativ

A

i=u/z

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4
Q

puterea?

A

IU, Puterea în fizică este mărimea fizică scalară ce caracterizează schimbul de energie în unitatea de timp.

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5
Q

factor de putere

A

cos φ, reprezinta o caracteristica a eficacitatii transferului de putere de la sursa de alimentare catre circuit valorile posibile de la 0;pi/2

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6
Q

Puterea aparenta

A

puterea maxima debitata de sursa de alimentare a circuitului, P=IU, P=I*2R, VA

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7
Q

Puterea activa

A

valoarea medie a puterii dintrun circuit de curent alternativ, Pa=Pcosφ, W

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8
Q

Puterea reactiva

A

valoarea de amplitudine a puterii transferate alternativ intre generator si elementele reactive ale circuitului,Pr=Psinφ, VAR

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9
Q

cand imax?

A

Ul=Uc sau Xl=Xc atunci i=U/R(rezonanta tensiunilor)

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10
Q

frecventa de rezonanta?

A

ν0=1/2pisqrt(LC)

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11
Q

Transormator

A

este compus din circuite electrice formate din 2sau mai multe bobine si circuite magneticece constituietole metalicece formeaza un carcas metalic

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12
Q

Bobina primara si secundara

A

In bobina primara se aplica tensiune pentru ca transformatorul sa functioneze, iar bobina secundara este bobina in care se induce TEM de inductie datorita fenomenului inductiei electro-magnetice.

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13
Q

Transformator coborator

A

U1

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14
Q

Transormator ridicator

A

U1>U2 , k>1

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15
Q

Randamentul transformatorului

A

n=P2/P1*100%

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16
Q

Tensiune in fire

A

U1=U2 + deltaU