Elemente recative si rezistor introduse in circut de curent alternativ Flashcards

1
Q

Cu ce ste egala intensitatea si tensiunea cand introducem un rezistor ohmic in curent AC?care este defazajul in cazul dat?

A

i=Imaxsinwt
u=Umaxcoswt
defazajul este 0

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2
Q

Ce sunt fazorii?

A

vectori trigonometrici care se rotesc opus acelor ceasornicului cu aceasi frecventa ca si a marimilor fizice date

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3
Q

Bobina ideala in AC.

A

i=Imaxcos(wt-pi/2)
u=Umaxcoswt
Umax=ImaxLw
defazajul intre U si I este de pi/2 in favoarea tensiunii

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4
Q

Condensator ideal in AC.

A

Umax=Imax/Cw

defazajul intre U si I este de pi/2 in favoarea intensitatii

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5
Q

Reactanta inductiva?

A

XL=Lw, rezistenta introdusa in AC de o bobina ideala

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6
Q

Reactanta capacitativa?

A

Xc=1/Cw, rezistenta introdusa in AC de un condensator ideal

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