electromagnet

I'm working on the electromagnet right now.  The black wire that I had turned out to be the same size (22 gauge) as the red stuff already on the magnet.
The thicker core makes a stronger magnet, and it doesn't get as hot.  The +12V from the PC power supply make the wire REALLY hot really quickly, and the magnet isn't that much more powerful than with +5V.  The +5V from the power supply is strong enough, but it gets kinda hot.  I'm not sure if it's too hot, but we should get 20 gauge wire just in case.
Wrapping the wire 2 layers thick makes it hotter, while only slightly increasing the magnet's strength, so I don't think we should do that.