The term transducer is commonly used in two senses; the sensor, used to detect a parameter in one form and report it in another (usually an electrical or digital signal), and the audio loudspeaker, which converts electrical voltage variations representing music or speech, to mechanical cone vibration and hence vibrates air molecules creating acoustical energy.
Types of transducers
Electromagnetic:
Antenna - converts electromagnetic waves into electric current and vice versa.
Cathode ray tube (CRT) - converts electrical signals into visual form
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