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Negative resistance would mean that you are creating power. I don't think that is possible.

In the strictest sense, you would be correct. But a negative resistance region is characteristic of some exotic semiconductor devices, such as a "tunnel diode"
http://en.wikipedia.org/wiki/Tunnel_diode
http://en.wikipedia.org/wiki/Negative_resistance





[This message has been edited by NJwirenut (edited 02-03-2007).]