Practice question

What is the primary function of the ignition coil in a petrol engine?

To filter impurities out of the petrol
To step up the 12-volt battery voltage to the very high voltage (10,000-30,000+ V) needed to create a spark across the spark plug gap
To cool the engine cylinders
To measure the engine speed

Answer: B — To step up the 12-volt battery voltage to the very high voltage (10,000-30,000+ V) needed to create a spark across the spark plug gap

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