Transformers

[Clive Apps Techno-Logicals 416 510 0020]

> 
> Other than ohms, and ratios, what is there to transformers?.
> Is there a breakdown voltage for insulation?.
> 
> 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?.  
> 
> The two books I got just say when the points open the field collapses,
> and generates a HV..


most coils are 3 terminal
a long coil with a tap very close to one end
ground is common to both HV and LV
when the points open the collapsing field in the short part generates
a HV back EMF along the entire coil
this is the spark

Clive