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A radio transmission costing 100 \( \mu \)J is sent once a minute. Its contribution to the average power is about

  • A.1.7 mW
  • B.6 \( \mu \)W
  • C.1.7 \( \mu \)W
  • D.100 \( \mu \)W

Answer: C

A hundred microjoules in sixty seconds is 1.67 microwatts, which at three volts is about half a microampere. Comparing that against the sleep current shows at once whether the radio or the sleeping electronics dominates the budget.

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