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The registering mechanism of an energy meter is driven from the spindle through

  • A.a magnetic coupling
  • B.a worm and gear train
  • C.a slipping clutch that engages only when the disc exceeds a certain speed
  • D.a light spiral spring which winds up as the disc rotates

Answer: B

A worm on the spindle drives a train of gears carrying the pointers or cyclometer drums, and the ratio is chosen so that the register reads directly in kilowatt hours. The friction of this train is one of the reasons a light-load adjustment is needed.

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