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A coin cell's usable capacity falls when the load takes short high current pulses because

  • A.the chemistry cannot recover between pulses at all
  • B.the capacity is defined only for alternating loads
  • C.its internal resistance drops the terminal voltage during the pulse
  • D.its rate of self-discharge rises along with the frequency of the pulses

Answer: C

A cell with tens of ohms of series resistance loses hundreds of millivolts at a ten milliampere pulse, and the brown-out detector may trip long before the cell is exhausted. A bulk capacitor across the cell supplies the pulse and is the standard remedy.

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