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Which consequence follows from a flat twelve volt battery in an electric vehicle?

  • A.The traction battery discharges
  • B.Only the accessories fail, which allows the vehicle to be driven to a garage although without lighting or heating
  • C.The vehicle cannot close its contactors and will not start
  • D.The vehicle operates normally, since the traction battery supplies the whole of the power required for driving

Answer: C

The contactors connecting the traction pack are held closed by the twelve volt supply, so without it nothing happens. Jump starting the twelve volt battery revives the vehicle. It is the commonest electric vehicle breakdown cause. The shared behaviour explains why these belong together and the differences explain why both exist. Checking which component actually carries the load settles most questions of this kind at once. A limit that survives making every external component ideal is an intrinsic one, and worth knowing for that reason.

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