randall r schulz rgpoguasonicnet thursday 14 february 2008 1645 aaron kulkis wrote note thats iron core conveying magnetic field windings conveying current note modern highefficiency transformers use alloy ferrite mumetal core alloys magnetic properties high magnetic permeability contain magnetic field better thus allowing less expand region outside transformers secondary windings allowing convert energy transferred primary magnetic field back electrical energy randall schulz wed 06 aug 2008 020938 0800 opensuse ot much power pc really consume