Mass Effect Part 2 What they mean by positive or negative current is never specified, in our world the sign on current specifies the direction.   Another thing to think about is whether or not a element zero actual exists.  The closest thing we can get to an element zero is something called neutronium, a material made entirely out of neutrons.  Neutronium is thought to only exist at the center of neutron stars, and to only be stable at extremely high pressures.  Unfortunately Neutronium probably doesn’t work as fantastically as it does in Mass Effect.                                                                                                                                  Illustration of a neutron star                                                                                                           https://upload.wikimedia.org/wikipedia/commons/e/e1/Neutron_star_illustrated.jpg