Well, the heat is caused by amperage. Amperage is caused by voltage and ohms. If the resistance is high the amperage is low and the heat is low. John T gave the ohms for 6v and 12v coils which will prevent too much amperage. The size of the wire is pretty much independent of the heat generated so long as the total resistance of the coil is in line.
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Today's Featured Article - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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