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Which quantity is parasitic drain?

  • A.The self discharge of the battery itself, which continues whether or not the battery is connected to the vehicle
  • B.Current drawn with the vehicle switched off
  • C.The current drawn by the starter motor, which is the largest load imposed upon the battery at any time
  • D.The charging current

Answer: B

Clocks, alarms and control units in sleep mode draw a small quiescent current, typically under fifty milliamps once everything has gone to sleep. Self discharge is a separate internal phenomenon, which makes the last option a genuinely different quantity. Tracing the requirement back to the physical constraint that produces it makes the answer follow. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb. Most errors here come from carrying a result across from a neighbouring case where it does not hold.

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