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Energy harvesting from indoor light typically provides

  • A.enough power to run a radio transmitter continuously and indefinitely
  • B.tens of microwatts, needing energy storage and duty cycling
  • C.several watts, comparable with a mains supply
  • D.a steady milliwatt independent of the lighting

Answer: B

A small indoor cell yields microwatts in ordinary office light, so the design must accumulate energy in a capacitor and act in short bursts. Matching the burst's energy to what can be gathered between bursts is the whole of such a design.

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