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The electromagnetic wave is "modulated" (changed) to represent the signal. For example, in AM (amplitude modulation), the strength (amplitude) of the wave is increased or decreased, according to the signal.

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Q: How do electromagnetic waves carry sound as electrical signals?
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Do sound waves carry electrical and magnetic energy?

No. Electromagnetic waves do.


What is the energy transformation of megaphone?

Electrical energy gets converted to sound energy. When we speak into the speaker, our sound waves get converted into electrical signals. These signals get amplified and emitted as louder sound. Thus, electrical energy (electrical signals) gets converted into sound energy (amplified/louder sound).


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With the speakers' electromagnetic coil!


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