Posted by JMOR on August 21, 2013 at 06:58:42 from (72.181.173.171):
In Reply to: HOT COIL posted by MarkB_MI on August 21, 2013 at 02:42:55:
A case can be made for resistor plus coil vs 'true 12v coil" with adequate intrinsic resistance to require no external resistor. That being, that the coil with external resistor will run cooler, since part of heat load is in coil & part in external resistor, whereas, with "true 12v coil", the coil must handle the combined heat of coil plus the heat that was formerly dissipated in external resistor. Obviously not terribly important as they survive the additional heat! HOT? To your hand? Sure, mounted to engine at 150 plus, combined with its own heat, it is happy, even at 200 degrees.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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