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Which risk does an open circuit secondary present to a coil?

  • A.Internal breakdown as the voltage rises without limit
  • B.No risk, since the coil simply produces no output when the secondary circuit is open during the operation
  • C.Overheating of the primary
  • D.Damage to the switching transistor, which is subjected to a higher voltage when the secondary cannot discharge

Answer: A

With nowhere to discharge, the voltage climbs until it finds a path through the insulation. The switching device genuinely does see a higher reflected voltage, which makes the last option a real accompanying risk. Never run an engine with a lead disconnected. The shared behaviour explains why these belong together and the differences explain why both exist. Tracing the requirement back to the physical constraint that produces it makes the answer follow.

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