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A purely inductive load draws 10 A at 230 V. Over an hour a correctly adjusted energy meter registers

  • A.1.15 kWh
  • B.2.3 kVArh
  • C.nothing
  • D.2.3 kWh

Answer: C

The torque is proportional to \( VI\cos\phi \) and the cosine of ninety degrees is zero, so the disc does not turn. The load nevertheless draws current and causes losses in the network, which is why reactive energy is metered separately for industrial consumers.

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