2. When varying electrical impulses are passed through the speaker of radio or any other audio system it changes into energy
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Electromechanical transducer, any type of device that either converts an electrical signal into sound waves (as in a loudspeaker) or converts a sound wave into an electrical signal (as in the microphone). Many of the transducers used in everyday life operate in both directions, such as the speakerphone on certain intercoms.
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