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A piezoelectric transducer is unsuitable for measuring a steady force because

  • A.no charge at all is generated unless the force is changing
  • B.the sensitivity falls to zero at low frequencies of vibration
  • C.the charge leaks away through the finite insulation resistance
  • D.the crystal fractures under a force maintained for any length of time

Answer: C

The charge is generated by the deformation and would persist, but the input resistance of any amplifier and the leakage of the crystal itself drain it away with a time constant of seconds at best. Such transducers are therefore used for vibration and shock rather than for static weighing.

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