Transformers

[Bruce Plecan]

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..

Cheers
Bruce