Say we have an inductor connected to an AC voltage source. Current will then lag voltage by 90 degrees. Does the current maintain it's previous value (as if the inductor was not there) but 90 degrees out of phase, or is it still dependent only on voltage? Rephrasing (in case that was poorly worded): Current is a function of voltage and resistance. Does reactance change this relationship? If the relationship doesn't change, how can current and voltage be out of phase with each other?