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I'm not sure what you mean by transformer. A transformer is used to change one voltage to another, and the only transformer in a simple ignition system I can think of would be the coil. Since most cars run on 12 volts delivered from a battery, and that is not nearly enough to ignite a spark in a car's cylinder, the coil raises that voltage to around 50,000.

I've described the transformer in a very basic ignition system. Today's cars use very sophisticated ignition systems using variations of what I just described in order to increase power and give better mileage. By using electronics to shorten the duration of the spark a set of sparkplugs can last 100,000 miles or more and modern cars no longer use "points" that can also wear out. Still, something has to increase that 12 volts to get a good spark.

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12y ago

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