How can 12 volts from a battery be changed to 40,000 volts for ignition?

A 12 volt battery voltage can be increased into 40,000 volts by the following steps:

1) Apply the battery voltage to the primary winding.

2) ICM or PCM will provide a ground to the primary winding.

3) A magnetic field will be created in the primary coil as the current is flowing through it.

4) The primary circuit will be turned off when the ground is opened by ICM. Thus the built up magnetic field in secondary winding will collapse.

5) This movement of the collapsed magnetic field will induce a voltage of 250 to 400 volts within the primary winding, which in turn induces 20,000 to 40,000 volts in the secondary winding. The current in the secondary winding will be around 0.02 to 0.08 amperes.