Hi to all, It may be a low-level question, but nevertheless, one to which I'm looking for an answer. The main question is as follows: - Within a Tesla coil, what is the main purpose of the capacitor and spark gap? Other such questions arising from the principle question: - What would be the outcome if you were to connect and A.C circuit directly to the primary coil, to then induce the emf through the secondary coil? - Would the same thing happen or would it be potentially more dangerous? - Are those two components truly necessary to achieve the breakdown voltage of the air and to create the visible sparks. Some may say I've asked numerous questions in this thread, but, in fact, the response to the main question should cover the other questions mentioned. Thank you for all help in advance, LanguageNerd.