That essentially creates a high resistance short-circuit which means your voltage will be lowered. The formula above will no longer apply. In that case you can try looking up your spark length ...

A poor conductor, or insulator, has high resistance. The two main ways of increasing the current in an electrical circuit are by increasing the voltage or by decreasing the resistance. If you ...

A circuit diagram shows how the components ... The diode has a very high resistance in one direction. This means that current can only flow in the other direction. Normally a diode will not ...