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Which vehicles commonly use a twenty four volt system?

  • A.Motorcycles
  • B.Hybrid vehicles, whose traction system operates at twenty four volts and supplies the auxiliary equipment as well
  • C.Heavy commercial vehicles
  • D.Passenger cars fitted with a stop start system, which requires the higher voltage to restart the engine rapidly

Answer: C

Trucks and buses use twenty four volts so that the same power is delivered at half the current, permitting smaller cables. Hybrid traction systems run at hundreds of volts, not twenty four. Forty eight volt mild hybrid systems are a separate development. Reading the definition literally, rather than recalling a summary, avoids the usual confusion. Tracing the requirement back to the physical constraint that produces it makes the answer follow. A limit that survives making every external component ideal is an intrinsic one, and worth knowing for that reason.

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