PM-
Thank you for your detailed answer. That effectively answers why completing and then breaking a circuit that charges a capacitor would not be a problem if the capacitor doesn’t have enough of a charge built up so that it discharges.
“If the capacitor does not reach its full capacity, does it store the remaining charge and need less time to reach capacity the next time…” Yes, for a limited amount of time. That’s why when you turn on your camera’s flash, turn it off when it’s almost ready, and then back on quickly, it will take much less time to be ready from the second “on” than it would have from scratch.
“…or does the electricity dissipate?” Also yes. The amount of time it takes depends on several factors; the voltage, the size of the charge, the size of the capacitor, “voltage leaks”, and possibly other things. My semi-educated guess in the case of a stove’s spark module is that it would lose its charge almost instantly. Sorry, I can’t give an answer with 100% certainty.
cherrybim-
“PM”s answer gets us both off the hook re: asking a rov why a stove that starts sparking as soon as the knob is turned would not be a problem as long as the knob is turned quickly enough (both on and off) so that it doesn’t spark.