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Which component fires an airbag electrically?

  • A.A solenoid
  • B.A small resistive element that ignites the propellant when a current of a few amps is passed through it
  • C.An initiator or squib in the inflator
  • D.A relay, which is closed by the control unit and therefore supplies the current required to inflate the bag

Answer: C

A squib is a bridge wire that heats and ignites the gas generating charge. The last option describes exactly that device, which makes it a correct and more detailed version of the same answer. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb. Checking which component actually carries the load settles most questions of this kind at once. Working one numerical case through both cases side by side fixes the distinction better than any rule of thumb.

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