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Which component transforms the low voltage into the spark voltage?

  • A.The control unit, which switches the primary current and therefore generates the high voltage in the secondary
  • B.The ignition coil
  • C.The distributor, which directs the current to the correct cylinder and raises the voltage in doing so
  • D.The spark plug

Answer: B

A coil is a transformer with a large turns ratio, and the collapse of the primary field induces tens of thousands of volts in the secondary. The control unit switches the primary, which makes the last option describe the trigger rather than the transformer. Tracing the requirement back to the physical constraint that produces it makes the answer follow. The shared behaviour explains why these belong together and the differences explain why both exist.

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