In this video, Steve Mould explains how an inflammable gas can be ignited with a spark created by the piezoelectric effect. At 01:11, there is a close up on the spark with a scale in the background.
I know that if a spark is created, that's because the voltage between the electrodes is so high that the electric field is above a critical limit that makes the air conductive. So it seems easy to guess the order of magnitude of the voltage given the value of the electric field and the distance between the electrodes.
But is there a simple way to "guestimate" the value of the current?
The real goal here is the estimate the energy released by the spark and compare it to the minimum ignition energy of the inflammable gas to see if the orders of magnitude are in the same range.
