Posted by Jerry/MT on December 27, 2007 at 20:58:32 from (206.183.116.129):
In Reply to: Another Coil question posted by John T on December 27, 2007 at 07:33:14:
John, I am not a double E but I believe that first part of 2) is the correct reason. (I had a debate in the N Forum on this very issue that I, unfortunately had to terminate (the debate not the the guy-grin)because the guy got nasty. He argued it made no difference becuase the induced voltage was always the same.)
My thinking is that the secondary current would have to be reduced with incorrect polarity. As I see it, the resistance at the plug tip is higher when current has to jump across the spark gap from the cold ground eletrode versus jumping the gap from the hot electrode to the cold ground. But the induced voltage is the same in each case since it is a function of the primary current and the turn ratio. So therefore the secondary current would have to be lower in the case of incorrect polarity operation. The spark power (the integral of eidt over the spark interval) would be less for the incorrect polarity than for the correct polarity. My simple minded approach is to see the spark gap as a series resistance, whose value is dependent on the direction of current flow. I hope this makes sense to you. It didn"t to the other guy.
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