Curentul alternativ Flashcards

1
Q

Ce se numeste cyrentul electric alternativ?

A

curentul electric valorile numerice ale marimilor fizice cel caracterizeaza variaza in timp conform legii armonice

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2
Q

Care este expresia ce ne permite sa determinam valoarea instantanee a a TEM in orice moment de timp

A

e=BSwcoswt (w-viteza unighiulara)

e=-dф/dt=-d(BScoswt)/dt

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3
Q

Ecuatia variatiei intensitatii?

A

i=Imaxsinwt

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4
Q

De ce este determinata generarea TEM de inductie?

A

este determinata de actiunea fortei lorentz asupra sarcinilor electrice din metal , care se misca in acest CM

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5
Q

Cu ce este egala cantitatea de caldura in curent alternativ?

A

Q=IUT/2 sau Q=Imax/sgrt2Umax/sqrt2T

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6
Q

Intensitatea si tensiunea efectiva?

A

I=Imax/sqrt2 U=Umax/sqrt2

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7
Q

Rezistorul Ohmic introdus in circuit de curent alternativ?

A

U=Umaxcoswt i=U/R , intensitatea curentului prin rezistor si tensiunea aplicata ei variaza in faza

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8
Q

Fazori?

A

vectori trigonometrici care se rotesc opus acelui ceasornicului cu aceasi frecventa ca si a masurilor fizice date

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9
Q

Bobina ideala introdusa in curent de AC?

A

i=Imaxsinwt, Umax=ImaxLw

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