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A load cell for weighing consists essentially of

  • A.a capacitive element whose plate spacing changes under load
  • B.an elastic element carrying strain gauges
  • C.a piezoelectric crystal loaded by the weight to be measured
  • D.an LVDT whose core is displaced by the deflection of a spring

Answer: B

The steel column or beam deflects elastically in proportion to the load, and gauges bonded to it report that deflection as a strain. A full bridge of four gauges gives both a large output and good temperature compensation.

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