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## Converting noise into electrical energy

Why do people ignore the QUANTITIES involved? Is this not the whole crux of this topic??? Does the amount of energy involved not strike you as relevant?
 Recognitions: Gold Member nydhruv, Welcome to Physics Forums! Your suggestion to store heat from the absorption of acoustical energy makes no sense. Did you read sophiecentaur's post(s) above? Do your maths. The AMOUNT or QUANTITY of this heat, if you calculate it, will be tiny, miniscule, infinitesmal, and hardly measurable.
 Noise is not a very large amount of energy at all. If a person were to scream as loud as they could for 5 years, they will have produced enough energy in noise to heat a cup of coffee.
 http://personal.stevens.edu/~mmohdisa/about.html Beyond this, there is now a capsule that generates microvoltage from low-frequency sound that powers implanted medical devices. The tech is new. It will evolve. I envision a transfer process or interface that would further the efficiency of the process. If the SPL can be transferred to a more effective conductor (liquid) I could see it being harvested more expressly. I keep watching with fascination.

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 Quote by Keith Edward http://personal.stevens.edu/~mmohdisa/about.html Beyond this, there is now a capsule that generates microvoltage from low-frequency sound that powers implanted medical devices. The tech is new. It will evolve. I envision a transfer process or interface that would further the efficiency of the process. If the SPL can be transferred to a more effective conductor (liquid) I could see it being harvested more expressly. I keep watching with fascination.
Did you read the conclusions? The Power levels involved are laughable (of course) in the results. Why would you expect that a "more effective conductor" would help? What new principle would it all be based on? They have used their resonators in an attempt to match the impedance of the incoming sound to their energy converter and they have a detectable amount (but so does any microphone) but they do not claim to be getting any more energy than is actually available.
Do you really believe that 'somewhere out there' there is a vast amount of acoustic power? If there were then we would be deafened!

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 Quote by LastTimelord Noise is not a very large amount of energy at all. If a person were to scream as loud as they could for 5 years, they will have produced enough energy in noise to heat a cup of coffee.
If you go into some cafes, you would have to scream a lot longer than that before you were served?

 Quote by kthouz Hello everyone! I have an idea of making a device that can convert noise into electrical energy. In many fields (industries, cars, construction machines,...), some used machines make much noise, then I thought as sound (noise) causes mechanical energy, why not convert that mechanical into electrical energy as microphones do to convert the sound into electrical signals? But here, i would like that device to be more efficient than a microphone. So if anyone worked on the same project or knows something about it that can be helpful, please let me know. Thank you. I will be posting here what i've done so far.
i want more information relating to this concept so pls most how to start this project

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 Quote by fzlsm i want more information relating to this concept so pls most how to start this project
I should read all the posts on this thread before you get too enthusiastic about the idea. You really need to consider just how many mW you might hope to harvest. Some people who have contributed don't seem to be aware of the significance of the actual quantities involved.
 hey i also have the same idea but i am confused from where to start and what concept to use. please help me
 Google "energy harvesting". These days it is possible to make things like wireless sensors that power themselves by harvesting energy in various forms (heat, sound, vibration etc). This is mainly because advances in low power electronics allows microprocessors to run on very little power. Just bear in mind that the law of conservation of energy applies. If you invent a magic box that harvests energy it won't be able to deliver more energy than is available to be harvested.

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