What's the word that refers to what a spark does as it is forming? "Energizing"? "Igniting"? What I'm looking for is akin to a fire "starting" or "igniting", but the word for what occurs as a spark comes to be.
Edit: One term someone suggested in EE.SE chat is "jumps", but jumps and discharges are more what sparks do once they are fully formed. That's their action. I'm looking for the word for their developing or formation.