simple experiment

1 Egg, & 2 Mobiles
65 minutes of connection between mobiles.
Initiated the call between the two mobiles and allowed 65 minutes approximately...(place the egg between the two mobile phone)

result:
During the first 15 minutes nothing happened;
25 minutes later the egg started getting hot;
45 minutes later the egg is hot;
65 minutes later the egg is cooked.

Conclusion: The immediate radiation of the mobiles has the potential to modify the proteins of the egg. Imagine what it can do with the proteins of your brains when you do long calls.

so the radiation of mobile phones is converted to heat energy,..

can this energy use to charge the mobile phones battery?

This post has been edited by ganabathi: Jun 16 2009, 05:10 PM

there is no such thing as sound energy. easily confirmed by looking at its unit (energy is measured in Joules)

though energy cannot be destroyed, most of it is converted into a form that is useless to us (read entrophy)

and if someone successfully come up with a way to convert any substantial amount of energy to another form at near 100% efficiency, i believe he would be in line to get a nobel prize.

Sound --> Motion ---> Electrical power

Theoretically possible, but the question that is at odds with this idea are :

- Efficiency....

What is the actual output when compared to the input?

Will it differ by a wide margin?

Seiko have kinetic powered watch, maybe when you combine with electricity generated by sound can charge the battery but not without battery. Again much of these topic is so far from application.

Eh...Sorry! It was suppose to refer to Kampung2005. He has a nick on trains. That fella's an engineer. He's the weird LRT/Train guy...
Sorry for the mistake and inconvenience caused.

Regards, Joey~~~

This post has been edited by Joey Christensen: Jun 16 2009, 05:38 PM

No worries.

Im more into fluids,structures,technologies.

I don't know what is the proper way of calculating efficiency because the info of the distance moved when force is applied is not known. Could someone enlighten me on this?

This post has been edited by Thinkingfox: Jun 16 2009, 06:17 PM

I don't think there's enough energy in ambient sound to charge up any electronic devices.

It can be designed to supplement the main power source but I think that's about it.

I don't know if there's truth in these 'internet fact' list that pops up once in a while but it's said that it takes a constant yelling of 8 years + to heat up a cup of coffee, hardly worth it don't you think

This post has been edited by SeaGates: Jun 16 2009, 06:58 PM

Graph of V/F (voltage per unit force) against frequency from wikipedia for piezoelectric sensor/material



Source: http://upload.wikimedia.org/wikipedia/comm...esponse.svg.png

It seems that at the optimal frequency, the voltage produced would be highest for a given force (sound waves)

This post has been edited by Thinkingfox: Jun 16 2009, 07:18 PM

anyhow, u wouldnt be able to use it for a long time, during duration of you talking, chemical energy not only converted to sound energy(for u to listen) but also heat and light energy. So, if you convert this sound energy(which i doubt), u probably receive, 60% of the energy back

A step forward

http://tech.yahoo.com/blogs/null/143945

Nokia has came out with a prototype phone, that is able to harvest radio waves, and turn it into energy

why not
sound also is a form of energy

I think it would be possible but using sound alone would not be sufficient enough.

not necessary sound... even movements, the sound waves or all those waves that is being transmitted in the air actually haz energy. you just need to find the right formula to convert it into the form of energy that u want. shake ur handphone also produces energy = tenaga kinetik =P

Its definitely possible, years ago no one ever thought of using solar energy to power a cellphone, today they've found a way to do so. So to answer your question really anything is possible, as long as you have enough funding (lol) to do the research. But just imagine though, if you can power things using voice, it would be kind of creepy, because someone would take those means to make some sort of bomb or some sort of illegal device to oppress others. What may be good for the people can always be turned into some sort of means/device for oppressing others... really blows when you think of both positive and negative effects.

ganabathi post is totally unrelated.

Sound energy haversting is possible, but is also inpractical. In cellphone, most of the energy is used to transmit the vocal information through radiowave, while only small amount is used to in microphone, speaker and LCD. This is why talktime is waaay shorter (due to high transmission energy), than standby and music playback time.

Assuming ideal condition with no energy loss, meaning the sound energy from speaker and human voice is 100% transfer into electric energy, it would probably prolong our talktime by a tiny bit, which is why I say inpractical.

Wave energy is measured in decibel (db). Human voice probably generate some miliwatt or microwatt of energy, hardly usable.

Piezoelectric is used as sensor, not energy harvesting. They are used in various application in favor of last generation sensor technology because of the size, and superior electric characteristic. Their output signal is normally very small, and often couple with an amplifier to magnify the value so that it is readable by other devices.

P.S.: Some technical information sharing:

There just isn't enough energy in sound i might say. Not pratical.

sound is not a type of energy. sound is a result of vibration of a medium.

how do you generate sound? you vibrate something, this vibration (kinetic energy) pass on to the nearest particle and to the next until it reaches another surface.

think pebble as source of sound, water as air, and side of pond as your eardrums and you have a good idea.

is it logical to transfer energy by sound? considering that
1, you need a line of sight,
2, sound wave tend to spread from its source,
3, most devices are electric based, and you'd have to convert the kinetic energy back to charge

you have an extremely inefficient way of transmission

This post has been edited by lin00b: Jun 25 2009, 12:19 AM

if u hv voice as loud as loud speaker .

very simple way to recharge elec always is through solenoid ...kinetic--> electric

because u guys talk about energy and its generation process, i have this thing in mind.

what if we put a magnet (+ all wiring and generator) around a fan to generate energy. will it be good? just like a dynamo. wont it be good as we switch on the fan, then it will generate electricity.

just my crazy thoughts.

oh old thread again. cant resist!