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A three-phase energy meter for a three-wire system uses

  • A.two elements each with its own disc and its own separate register
  • B.two elements driving a common spindle
  • C.three elements driving a common spindle, one for each phase of the system
  • D.one element with its pressure coil switched between the phases in turn

Answer: B

Blondel's theorem applies to energy just as to power, so a three-wire system needs two elements. Both act on the same spindle, or on two discs on one spindle, so that the register adds their contributions automatically.

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