Not sure where to post this... I'll try here for starters.
So a transformer takes in 110/220 @ 60Hz from the wall, surrounds an iron core with "hot" coil windings. A magnetic field results. Lower voltage AC is produced by a secondary coil thats immersed in the field.
If a strong magnet is placed next to either coil, does the steady magnetic field produce DC in either coil?
If thats the case and you had a strong enough magnet and an efficient enough coil... could the resulting DC be used to replace a battery?.