So I've been reading up on induction cook tops and the gist of it is the magnetic doo-hicky makes the the the heat release directly from the pot instead of the having heat transferring from outside of the pot to inside which wastes energy. They work with any stainless steel that sticks to a magnet ,cast iron and carbon steel( I think?) . Does it only heat on the bottom of the pot/pan? or would the whole pot heat up evenly ( assuming every part is made from the same material). If so then would that mean if I cook it with an cast iron dutch oven covered, it would mimic the effect of an oven right?