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An energy meter differs from a wattmeter in that it

  • A.requires no pressure coil
  • B.integrates power over time
  • C.measures the reactive rather than the active part of the power taken by the load
  • D.reads the maximum power reached during the period rather than the average

Answer: B

A wattmeter indicates the power at each instant; the meter's disc turns at a speed proportional to power, so the number of revolutions counted by the register is proportional to the energy. It is an integrating instrument rather than an indicating one.

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