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An energy meter is connected with its current coil reversed but its pressure coil correct. The disc will

  • A.turn forwards as before
  • B.not turn at all
  • C.turn forwards but at half its correct speed for the same load
  • D.turn backwards and the register may be prevented by a ratchet

Answer: D

Reversing one of the two fluxes reverses the sign of the torque, so the disc runs the other way. Meters intended for one direction of energy flow are fitted with a ratchet to prevent the register running backwards, which also makes reverse connection a detectable fault.

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