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The wattage marked on a fluorescent lamp excludes

  • A.the light output of the lamp
  • B.the lamp's own filament heating
  • C.the reactive power the circuit draws
  • D.the loss in its ballast

Answer: D

A 36 W tube on a magnetic ballast draws about 46 W at the circuit, so an audit that counts lamp wattages alone understates the load by a fifth. Circuit watts, measured or taken from the gear's data, is the figure to use.

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