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 - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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