Wow we are definitely going down the electrical rabbit hole here Gray. You are making me dig back into info I have not looked up in years. To further present my case, the 'storage' term is acceptable and standardized. Please see the Federal-Mogul guide "All About Ignition Systems", page six, "Ignition Technology Terminology", "Energy Storage", for standardized instructional use of the term. http://beru.federalm...13_lowres_0.pdf
Mathematically speaking- in physics you have the law of the conservation of energy (Joules). The stored energy in an ignition coil can indeed be measured in milli Joules and is a testable process, the result is referred to properly as 'stored energy' or the value E in expressed equations. If you go back to the old school days of designing ignition systems for race cars, being able to calculate this was critical in selecting the most optimal coils for a particular application. This is still an extremely valuable electrical property and in use by all designers / manufacturers of ignition coils.
Here is a very good layout of a DIY test setup for determining coil energy storage values: http://dtec.net.au/I...rgy Testing.htm
You can correctly and acceptably state that ignition coils store and discharge energy, even though they are based on the transfomer principal. With a typical inductive ignition coil, 12v is applied and as the primary coil current ramps up, energy is being stored. The energy stored is measurable by calculating:
E = (1/2) * L * I^2, where L is the inductance of the primary coil, and I is the current.
This math is exactly like formulas for energy on a charged capacitor, such as:
E = (1/2) * Capacitance * Voltage^2 - or - Kinetic energy of a moving mass: E = (1/2) * Mass * velocity^2
This is my basis for use of the specific term 'storage', albeit overly and purposefully informal in my initial post- but I never meant it in the sense of similar to a battery. More as my own casual way to express difference with a CDI coil from a Kettering coil, even though at the engineering level they are both operating on the exact same physics and principals.
- E.G. In my own low-level layman non-engineering terms, a CDI coil is only responsible for transferring and magnifying the energy to spark whereas a Kettering coil is responsible for building / storing the charge as well as transferring / magnifying it to spark. Is that statement wrong from a purely electrical engineering standpoint ? Sure is, no argument there. Is it ok to use in most non-engineering places casually as a way to simply decribe a difference in coil operation without getting into an engineering detailed discussion? it's been acceptable at least until now.. lol