I always like to imagine in games how could the game universe could actually function. So I was pondering how the elder scrolls magic and enchantments could be "possible" through my rather elementary understanding of basic physics, so here it goes. Magic and enchantments are simply the process and ability of being able to effect a particles energy levels. For fire and ice it would be effecting the thermal energy. For example a fire sword would transfer its kinetic energy into an exothermic (endothermic for ice) energy reaction when struck against an object. And for electricity spells and enchantments it transfers kinetic energy into a high voltage potential that will arc through air or enemies. And for any spells you use your personal magika to cause these energy changes. And in turn also to further power enchantment reactions would be by use of souls in soul gems. Also for regenerating magika, it could be a person's ability to convert and harness photon light energy, magnetic energy, and other natural energies into their personal energy. Potions could be a chemical energy as well. So that's my bit of rambling, but I hope others can add to my realism thoughts.