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Which figure is typically acceptable for parasitic drain?

  • A.Under about 500 milliamps, which allows for the several control units that remain powered while the vehicle stands
  • B.Zero
  • C.Under about 5 milliamps, which is the figure specified for a vehicle fitted with an alarm and a tracking device
  • D.Under about 50 milliamps once asleep

Answer: D

Most manufacturers specify between twenty and fifty milliamps for a vehicle at rest. Zero is impossible with a clock and an alarm. Very low figures apply to simple vehicles, which makes the last option plausible for a different class of car. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision. The order in which the effects act is what decides the outcome, so it is worth establishing first.

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