Investigations were carried out on point-to-plane dielectric barrier discharges with two different gas gap lengths (d = 0 and 2 mm), energized with two different high voltage power supplies providing one an ac signal at 15 kHz and the other a pulsed signal with a same repetition rate. Correlations between the electrical properties and the behavior of the plasma in these different situations were established through ozone generation, and by the way O radicals net production, checking for this purpose that in our operating conditions gasheating influence remained minor. Using the representation ozone concentration vs. charge amount transferred through current pulses, the specific electrical and thus physical properties of pulsed surface discharges are put in light; in these discharges, compared to ac and pulsed volume discharges, current pulses exhibit, for a given charge per pulse, the highest amplitudes and the shortest durations.