Actually, a spark can still be produced WITH NO CONDENSER WHATSOEVER in the ignition primary circuit, albeit not as intense as it is if a proper sized condensor is indeed located in the circuit in paralell with the points.......The condensor in addition greatly extends the life of the ponts ......
The coil still draws straight DC (I = E/R) current when the points are closed and the inductive effect has diminished, its just that the current is constantly being switched on then off then on then off as opposed to alwaysssssss being on when not running with ignition ON (assuming points closed) therefore more heat is generated. The inductive reactive effect a coil has is evidenced at current turn on time and current turn off time but is NOT evidenced during steady state DC conditions, at which time its a pure resistive load with I = E/R. Impedance (for AC) is dependant upon frequency while resistance (at DC) is not.
The purpose of a voltage dropping current limiting resistor used in many tractors and autos etc is two fold, yes it reduces coil current (to avoid overheating) but it also reduces the amount of current the points are forced to switch so they dont burn up prematurely
Hope this helps the original popster better understand the good old fashioned Kettering Ignition system
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Today's Featured Article - Sunday Drives - by Cowboy. Summer was finally upon us here in Northern Maine. We have two types of industry up here, one being "Forestry" (Wood Products) and the other "Farming" (Potatoes). There is no shortage of farm tractors and equipment around here! I have been restoring old Farm Tractors for the past 6 years, and have found it easier and less expensive to hit all the auctions and purchase whole tractors for parts needed. My wife who works at a local school, and only has weekends and summers off, while on t
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