ignition coil questions

And inquiring minds wonder how 10 to 20KV is possible to fire a plug. This happens because V = L di/dt. L is the coil inductance. di/dt is the change in current with time. When the points, or transistor in the mopar box opens the current goes from a high value to zero quickly, resulting is a high voltage. The mopar box creates a higher voltage than points, because points bounce and have leakage when opening. A transistor is better switch to interrupt the current.