1)

RLC série ????

Si oui : Z = R + jwL + 1/(jwC)

Z = R + j(wL - 1/(wC))
Z = R + j(w²LC - 1)/(wC)

Phi = arctg((w²LC - 1)/(wRC))

Avec R = 5 ohms, C = 4.10^-6 F et w = 2.Pi*250 = 500.Pi rad/s

Phi = arctg((25.10^4.Pi² * 4.10^-6 * L - 1)/(500*Pi * 5 * 4.10^-6))

Phi = arctg((Pi² * L - 1)/(0,01*Pi))

Phi = arctg(100.(Pi² * L - 1)/Pi)
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2)
|Z| = Racinecarrée[R² + ((w²LC - 1)/(wC))²] = ...

I efficace = (VAB(efficace))/|Z|

P moyen = R * (I efficace)²

P moyen = R * (VAB(efficace))²/|Z|²

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Sauf distraction.