1. The problem statement, all variables and given/known data When reading about directions of magnetic flux in relation to current flow on pages 6 to 8 of http://www.free-energy-info.tuks.nl/Non-Ferrous-Magnet.pdf , I found that in figure 11 the current is travelling from + to - terminals, while in figure 12, the current flows from - to + terminals. I am still learning about the basics of circuitry and magnetism, and I want to understand why and how a current can flow in both directions. 2. Relevant equations None that I know of. If there are some I would like to be enlightened. 3. The attempt at a solution After reading this article "http://www.blueraja.com/blog/179/do...tive-to-negative-or-from-negative-to-positive" I found that from a Physics standpoint a current would travel from - to + in reference to electron flow, but in electronics it doesn't matter. Why doesn't it matter? Can a current move both ways or only one?