Izmjenična struja Flashcards by Edita Lukic | Brainscape

Q

trenutni napon

A

u=U_0 sin⁡(ωt)

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Q

trenutna struja

A

i=I_0 sin⁡(ωt)

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Q

efektivni napon

A

U=U_0/√2

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Q

efektivna struja

A

I=I_0/√2

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Q

tri vrste otpora

A

radni, induktivni i kapacitivni

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Q

induktivni otpor

A

R_L = Lω

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Q

kapacitivni otpor

A

R_C = 1/Cω

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Q

ukupni otpor (impedancija)

A

Z = √(R^2 + (R_L - R_c )^2 )

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Q

fazni pomak, φ

A

cos⁡φ = R/Z

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Q

kad je ukupni otpor najmanji

A

R_L=R_C

frekvencija koja se tad dobi je rezonantna frekvencija

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Q

snaga u krugu izmjenične struje

A

P=UIcosφ

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Q

transformator

A

U1/U2 = N1/N2 = I2/I1

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