We discussed this manner in terms of inductor, not so long ago. I fully understood from many posts provided why does it lag. I mean, not everything can be fully understood but I got a good intuition about it. Question arose not so long ago, and I couldn't find anything good on the internet. Why the current lead voltage in capacitor? Does this has something to do with dielectric field? Can anybody provide me with some good links addressing this problem, or explain? Thanks.