transformers

Robert W. Hughes rwhughe at hal-pc.org
Fri May 29 03:27:10 GMT 1998


> 
> This might seem off the wall but,   If one side of the coil's secondary
> is open (point side), and the other side is connected to a spark
> plug, how is there any flow of electrons with the one side open?.
> 
> With the one side open, but yet connected thru the coil to the+ side
> does that make the return path?.  
> 
One side of the secondary goes to the plug, the other side is tied to
the side of the primary that is connected to the points. The other side
of the primary is connected to the battery. When the points open there
is a current loop from ground through the battery, coil primary, coil
secondary, plug gap, and back to ground. The primary is phased so that
the voltage generated across it by the collapsing field (300-400 volts)
is added to the secondary voltage. This is why coils have polarity
marked on them. If you connect it backwards you lose almost a kilovolt.
This also means that there is at least 12 volts across the plug gap
while the points are open.
-- 
Robert W. Hughes (Bob)
BackYard Engineering
Houston, Texas
rwhughe at hal-pc.org



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