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Re: + or - ground whats the difference?
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Posted by Jon H on January 25, 2005 at 08:56:09 from (69.26.18.86):
In Reply to: Re: + or - ground whats the difference? posted by jdemaris on January 25, 2005 at 06:41:13:
There is another factor to consider concerning coil polarity. Electricity flows from a hot electrode to a cooler electrode very easily,while it can take 50% higher voltage to get the same flow from a cool electrode to a hot one. A sparkplug is designed so the center electrode and insulator runs hot enough to burn off any combustion deposits that would cause a short and foul the plug. The center electrode runs much hotter than the side electrode for this reason. Spark has a much harder time jumping from the cooler side electrode to the hot center plug electrode than it does jumping from center to side,so coil polarity/spark flow direction is very important. This effect of electricity flowing easily from a hot to a cool electrode,but not the reverse is so pronounced that it is the basis for the working of a radio rectifier tube or an old tungar/tunger bulb battery charger which convert AC to DC.
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