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The transducers which requires an external power and their output is a measure of some variation such as resistance, inductance, capacitanc…

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The transducers which requires an external power and their output is a measure of some variation such as resistance, inductance, capacitance etc., are called as
  • AActive transducer
  • BPrimary sensor
  • CPassive transducer
  • DSelf generating transducer
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Active transducers are those which do not require any power source for their operation. They produce an electrical signal proportional to the input.

Passive transducers require an external power and their output is a measure of some variation such as resistance, inductance, capacitance etc.