Practice question

What is the function of the ignition coil in an automotive gasoline engine?

To regulate the voltage output of the alternator to protect the ECU.
To convert low-voltage direct current (12V) from the battery into the high-voltage (20,000V+) required to jump the spark plug gap.
To charge the battery during starting by acting as a step-up transformer.
To control the spark plug firing sequence mechanically.

Answer: B — To convert low-voltage direct current (12V) from the battery into the high-voltage (20,000V+) required to jump the spark plug gap.

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