This Demonstration shows the variation with time of the current I in a series RLC circuit (resistor, inductor, capacitor) in which the capacitor is initially charged to a voltage . The resonant frequency of the circuit is and the plotted normalized current is . There are three types of behavior depending on the value of the quality factor : overdamping when (no oscillation); critical damping when , (no oscillation and the most rapid damping); and underdamping when (damped oscillations).