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Creeping in an energy meter means that the disc

  • A.fails to start turning until the load exceeds a few per cent of its rating
  • B.reverses direction when the load power factor becomes leading
  • C.rotates slowly with the pressure coil energised and no load current
  • D.runs progressively faster as the bearings wear during years of service

Answer: C

It is the classic consequence of over-generous friction compensation, though vibration, stray fields and an excessive supply voltage can also produce it. The meter then registers energy that has not been consumed, which is why it must be prevented.

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