Ignition coils

An ignition coil (also called a spark coil) is an induction coil in an automobile's ignition systemtransforms the battery's 12 volts (6 volts in some older vehicles) to the thousands of volts (20 to 30 thousand volts) needed to spark the spark plugs. The wire which goes from the ignition coil to the distributor and the wires which go from the distributor to each of the spark plugs are called high tension leads.




Source:
http://www.youtube.com/watch?v=x61wUurKRFs&NR=1
http://en.wikipedia.org/wiki/Ignition_coil

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