Jim Yanik wrote:

Well,then it violates basic physics.If you have two voltage sources of
slightly different voltages,currents DO flow between them.That's a basic
principle. And bimetal TCs are simply millivolt voltage sources.

Just in case you are not just a Taver sock puppet and are
truly as technically challenged as your posts indicate:

http://www.allaboutcircuits.com/vol_1/chpt_9/5.html

Rick