EXERCICE IV - Concours Geipi Polytech
EXERCICE IV - Concours Geipi Polytech
EXERCICE IV - Concours Geipi Polytech
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tension (en V)Evolution de la tension aux bornes du condensateur121086420-2-4-60 10 20 30 40 50 60 70 80 90 100temps (en μs)REPONSES A L’<strong>EXERCICE</strong> IIII-1- Equation : u = (R+R A ) i Résistance R = 6,0 ΩII-2-Appareil de mesure : OhmètreII-3-Equation différentielle : u = (R+R A ) i + L di/dtII-4- Expressions : α = u /(R+R A ) β =- u /(R+R A ) γ = L /(R+R A )II-5- Expression i(t =γ) = u(1-e -1 ) /(R+R A ) application numérique : i(t =γ) = 0,39 AConstante γ = 60 μsInductance L = 0,48 mHII-6- Condition sur C : C < 4L/R 2II-7- Expression littérale : L =T 2 /(4π 2 C) Application numérique : L = 0,50 mH