The secondary coil usually has lots of of occasions extra turns of wire than the first coil. This sort of plug is designed with a ceramic insert that has a smaller contact space with the metallic part of the plug. This reduces the heat transfer from the ceramic, making it run hotter and thus burn away extra deposits. Cold plugs are designed with extra contact area, so they run cooler.
The engine control unit controls the transistors that break the ground aspect of the circuit, which generates the spark. Instead of one major coil, distributorless ignitions have a coil for each spark plug, positioned instantly on the spark plug itself. The coil is an easy device — primarily a high-voltage transformer made up of two coils of wire.
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