A) Relation tension courant
| Composant | Résistance | Inductance | Condensateur |
| Loi d’Olhm | V(t) = R. i(t) | V(t) = L. di(t)/dt | I(t) = C. dv(t)/dt |
| Régime Périodique | Vmoy = R.Imoy Veff = R.Ieff | Vmoy = 0 | Imoy = 0 |
| | | | | |
| | V = R.I | V = j.L.w.I | V = I/j.C.w. |
| | V = R.I | V = L.w.I | V = I/C.w. |
| Déphasage | 0 | π/2 | -π/2 |
B) Impédance complexe
Z = V / I = (Z Ð j) = R + j. X
Y =1 /Z = I / V = (YÐ -j) = G + j. S
association en série : Z = S Zn
association en parallèle : Y = S Yn