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A photovoltaic cell is an active transducer because it

  • A.requires a bias supply before any current will flow through it
  • B.emits electrons when the illumination exceeds a threshold
  • C.generates a voltage when illuminated
  • D.changes its resistance when illuminated by a light source

Answer: C

Light absorbed at a junction separates carriers and drives a current through an external circuit, so the device supplies power rather than consuming it. The solar cell is the same device used for generation instead of for measurement.

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