Sequential electric circuit comprises two inductors L1 = L2 = 0,05Gn 0,075Gn separated 0.02mkF C = capacitance and resistance R = 800 ohms, and connected in series. From 2 Kirgofa law, to make the differential equation of oscillations of an electric charge, his decision to record and determine the cyclic frequency and period of damped oscillations. To determine the time in which the energy of the electric field of the capacitor is reduced to 7.34 times.