MLA Citation: Bloomfield, Louis A. "Question 995"
How Everything Works 22 Jan 2018. 22 Jan 2018 <http://howeverythingworks.org/print1.php?QNum=995>.
995. How much electric current is there in an automobile spark plug? — DG, Brooklyn, NY
Without measuring it directly, I would guess that the current passing through a spark plug during a spark is about 10 milliamperes. I base that guess both on a calculation—assuming sensible values for the energy, voltage, and duration of the spark—and on my experience with electric sparks. If I have a chance to measure the current directly—I have the equipment but not the time—I'll put a more specific value here.

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