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Which turns ratio is typical for an ignition coil?

  • A.Around 10 to 1, which is sufficient to raise the twelve volt supply to the voltage required at the spark plug
  • B.1 to 1
  • C.Around 1000 to 1, which is required in order to produce the thirty thousand volts needed to jump the plug gap
  • D.Around 100 to 1 or more

Answer: D

Ratios of a hundred to one and upward are usual, and the rapid collapse of the field multiplies the effect far beyond the simple ratio. Some coils genuinely approach a thousand to one, which makes the last option a real figure for certain designs. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision. Reading the definition literally, rather than recalling a summary, avoids the usual confusion.

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