No, entirely different, although both coils and spark plugs have been around since the beginning of time....well, modern time, or as we might say in montana, horseless carriage time, lol.
A spark plug is a spark plug. Todays are better engineered and designed than the very first working spark plugs, but they look and work just alike. A coil pack (think of a rack with 2, 3 or 4 individual coils attached) is a modern day version of the same coil that has been a fixture on automobiles since the beginning of ( mass production). Same function, same design-only packaged different to accomodate todays distributorless ignition systems, where electronics have taken over many previous mechanical operations, like the distributor, for one. Manufacturers just built bigger and more complex systems around the coil and the spark plugs, or that what makes the internal combustion engine work, you know.
The function of the coil or of the coil pack is to dramatically increase the voltage to the spark plug. Think of it, only 12 volts from the car's 12 volt system enters the coil, but exiting the coil and going to the spark plug is a voltage measured in the thousands, 40 to 60 thousand volts in modern systems, and before electronic ignition when cars used mechanical "points" to make and break electrical contact so the coil would do it's job, the coil output was something around 10,000 volts, still a shocking upgrade as I recall.
Now why is this necessary, you ask? Because the function of the spark plug is to simply provide a path for an electrical current from the coil to jump to ground by jumping a gap at the end of the plug with a spark. The bigger the voltage push, the bigger the spark.
Well, there you go, diego, hope you understand it a little better. I'm no expert, still don't know a lot about electrical theory, and car systems, but you have to learn a little when you can't afford to pay somebody else to fix it.
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