[Marc P.]

I remember we spent a week on this topic in physics class, but that was 3 years ago so I don't remember too much of it. What I do remember is the teacher explaining the differences between conventional current and actual current...

Conventional current is what most people recognize- electricity flowing from positive to negative, as it makes logical sense- higher concentrations of things/surplus (positive) moving towards a lower concentration/deficit (negative) to balance out.

On a technical level though, the actual charge is negative- as electrons are generally negatively charged. Electrons are much much less massive than protons, and hang out on the fringes of the atom, and so are much easier to toss around. Therefore, it's actually the negative charge that's traveling through the wire.

If that makes no sense, or is completely wrong, please correct me... this sort of thing has always fascinated me.