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A design's energy budget should be constructed in

  • A.energy per event, summed over the events in a day
  • B.peak current, which is what the cell must supply
  • C.average current at the nominal supply alone
  • D.the sleep current of the deepest mode available

Answer: A

Counting the wake-ups, the radio transmissions and the sensor readings a day and costing each in microjoules gives a figure that can be compared against the cell and attacked item by item. Average current hides which activity is responsible.

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