Take the 2-minute tour ×
Physics Stack Exchange is a question and answer site for active researchers, academics and students of physics. It's 100% free, no registration required.

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

share|improve this question
7  
That's what microphones do. –  ACuriousMind Aug 31 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 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.

share|improve this answer

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.