THE SCIENCE LAB
'(<a href="http://www.j-archive.com/media/2008-02-20_J_04.wmv">Sarah of the Clue Crew holds a magnet to a lamp bulb.</a>)  When lit, the filament becomes a magnet; using another magnet, we can see it move, showing this type of electricity that reverses directions & continuously switches the filament's magnetic poles'
alternating current