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Energies of wind and water can produce electricity. But, can sound energy also be used to produce electricity?

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That's what microphones do. – ACuriousMind Aug 31 '14 at 17:35
Strictly speaking, only moving-coil and piezoelectric microphones generate electricity. Other types require an external power source to produce a signal. – steveverrill Aug 31 '14 at 22:58

1 Answer 1

In principle, sure. That's what microphones are, as ACuriousMind points out. But if you want to power anything substantial, an important issue to overcome is the relatively small amount of energy contained in sound waves.

According to this website, the front rows of a rock concert have a sound intensity of $10^{-1}~\text{W m}^{-2}$. So even if you had a square meter of material that was capable of harnessing all of that energy, that tenth of a watt doesn't get you all that far.

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