The basic principle of ignition is that the battery current first flows through the primary winding of the ignition coil. This winding consists of several turns of thick wire. Under the influence of current around the ferromagnetic core of the ignition coil, a powerful magnetic field is formed - our ignition energy.
When the piston in its cylinder approaches the point at which the incoming and compressed air-fuel mixture should ignite - the point of ignition - the current to the ignition coil is interrupted.
When the current is turned off, the magnetic field in the ignition coil disappears. In this case, the following happens: in the secondary winding, a high-voltage current pulse of several tens of thousands of volts arises from numerous turns of thin wire.
This ignition voltage is sent directly to whichever spark plug is next in the engine's ignition sequence. The mixture ignites and the engine continues to run. The electrical circuit closes again and the action begins again.
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