1 To change the 6 or 12 volts of the car battery to a voltage high enough to Jump across a spark plug gap, a transformer (an induction coil usually called the ignition coil) is used.
2 It has two circuits in it, a primary circuit and a secondary circuit. The latter has many thousands of turns of very fine wire.
The primary winding is of Just a few hundred turns of heavy wire and is usually wound on the outside of the secondary.
3 Both winding are around the same center soft iron core and are separated by an insulating material. The entire unit is sealed into a metal case to which a top of insulating material is attached.
This also forms the terminal for the high voltage lead that goes to the distributor.
4 When current is allowed to flow in the primary circuit, a magnetic field builds up around it and passes through the turns of wire making up the secondary winding.
5 When the current abruptly stops flowing through the primary, the magnetic field surrounding it collapses back in toward it.
6 The lines of force in the field thus pass across the turns of the secondary winding, inducing in it a high voltage.
This created high voltage surge is then conducted to a spark plug where it ignites the air/fuel mixture.
7 The ignition coil is a device which
Ignites the air/fuel mixture
Controls the firing of each cylinder;
Transforms the battery voltage into a higher voltage for ignition
Stops and starts current flow to the spark plug.
The ignition coil is entirely dependent upon outside factors in order to perform.
It doesn’t control, but rather, its operation is controlled.
THIS IS JUST A BRIEF ARTICLE ABOUT IGNITION COILS
Article Source : This article courtesy should goes to Auto Mechanics Autodology – Technicle instruction manual by System Operation Support.