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A 2 F supercapacitor charged to 3 V and discharged to 2 V has delivered

  • A.4 J
  • B.1 J
  • C.5 J
  • D.9 J

Answer: C

The energy stored is half the capacitance times the square of the voltage, so nine joules at three volts and four at two, a difference of five. A harvesting design's burst budget follows directly from that difference and the permitted droop.

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