urgent!!!!!!!!!!!!!! can sound be converted into electricity by microphone ?????/?

Question

can that electricity be stored & used for domestic and industrial purposes???

it's for the science project fair to be held in city..........

i need help.....................please be serious..................

Answer 1

We use microphones to convert sound in air into and electrical signal.

Ya sound can be converted to electricity.

These electrical signals can be amplified (increasing the voltage and current) so that it can driver a loudspeaker.

Microphones come in two types : electro-mehcanical and piezo-electric.

Electro-mechanical microphones use a small diaphram attached to a coil of wires suspended in a magnetic field. When the vibrations in the air cause cause the diaphram to vibrate, the movement of the coil of wire in the magnetic field generates a small electric current.

Piezo-electric microphones harness the physical properties of certain types of crystal which generate a very small electrical signal when placed under stress. In this case, the stress is placed on the crystal by the vibration of air molecules.
Once we have sound as an electrical signal we need to convert it to numbers by means of a Digital to Analogue Converter also known as a DAC or D/A .

The electricity which is used to light household bulbs needs some watts to enlighten. but the Watt produced by microphone's sound is less so it cannot enlighten a bulb. it can be used to enlighten a LED.


U can also take the reference of this article which I got from Technology Research NEWS....

Researchers from Los Alamos National Laboratory and Northrop Grumman Space Technology have built a compact generator that converts heat to electricity with the relatively high efficiency of 18 percent.

The generator is simple, making it potentially long-lived and easy to maintain. This makes it especially appropriate for generating electricity aboard spacecraft, according to the researchers.

The generator uses a small version of a thermoacoustic sterling engine developed at Los Alamos in 1999. That engine converted heat to acoustic energy using no moving parts. Compressed helium cycles between heat exchangers, and the movement of the gas generated sound waves.

In the generator, the sound waves from the engine drive a piston, which moves a coiled copper wire. As the wire moves through a magnetic field produced by a permanent magnet it produces electricity.

Existing spaceship thermoelectric power converters are about seven percent efficient, and produce 5.2 watts per kilogram. The researchers' thermoacoustic sterling heat engine could eventually produce 8.1 one watts per kilogram, according to the researchers.

The researchers' next steps are to better match the engine and alternator to make the engine more efficient, and to reduce the engine's volume.

A space power application could be practical in two to five years, according to the researchers. The work appeared in the August 9, 2004 issue of Applied Physics Letters.

Answer 2

YES - the microphone is a diaphragm device, where a compression wave (created by sound) hits the diaphragm connected to a movable magnet within a coiled wire. It works on the same principles as a dynamo, a tiny current is produced and is passed to an amplifier where it is amplified to allow you to hear it.

If you have a vinyl record - the surface is essentially a single groove along which a needle passes creating vibrations and (using the same principle as the microphone) once amplified - creating sound [this is an example of analog storage medium]

Sound can be recorded into a computer (via a microphone) and through a process of electronic sampling - a digitised signal can be stored either in the computer's memory or on a disk [CD or DVD]

Look up ADC (analogue to digital conversion) and DAC (digital to analog conversion) on Google - there should be loads of technical stuff there appropriate to the level of your project.

Hope this helps

Answer 3

Actually that is the purpose of the microphone. It converts sound in to small amounts of electricity which can then be amplified and returned back to sound, by a speaker. The electricity can also be modulated onto a carrier and sent across the airwaves and picked up by another radio and demodulated and turn back into sound by the radios speaker.
Now that is a very very simple explanation, but to answer your question, Yes, a microphone can convert sound to electricity.

Answer 4

A microphone consists of a diaphragm, a magnet, and a coil of wire. When you speak into it sound waves created by your voice vibrate the diaphragm which is connected to the magnet which is inside the coil of wire. These vibrations cause the magnet to move inside the coil at the same frequency as your voice. A magnet moving in a coil of wire creates an electric current. This current which is at the same frequency as your voice is carried by wires to whereever you wish it to go like an amplifier, transmitter, etc.

Answer 5

Theoretically, you could have a very thin magnet that oscillates to the sound waves. If it's surrounded by a copper coil, it'll create an AC current. This electricity could be stored in a battery.
Practically - no. If done extremely well, you might be able to incorporate it into a watch - however, you'll have to shout into it all day.

Answer 6

When any substance is piezoelectric it means then when a pressure wave is placed upon it, the crystal slightly compresses and when it's released it releases a high frequency voltage spike. typical microphones are cermet ceramic and when an audio pressure wave hits them they are capable of not only putting out a small voltage, but their impedance (resistance) changes. You can see the same thing happen with large ceramic capacitors when you flex a circuit board, they will release a small voltage which can hose up your readings. Only caps that aren't piezoelectric are Niobium oxide and film capacitors.

Answer 7

You need to think about this one. The power output from a microphone is of the order of a few micro-watts (millionths of a Watt). You'd get at least ten thousand times more output power using a hamster in a wheel, turning a generator!

Answer 8

That is the principle behind the telephone: vibrations moving a magnet in a coil, generating electricity.
Now, if you want to use that, you'll have to talk loud and long, for there is precious little power in such vibrations.

Answer 9

no, what is being converted is the tiny vibrations carried in the air by the sound, i do imagine you can convert that to electricity but it would be such a small amount it would be impractical

Answer 10

i dont think sound can be converted in to electricity using a microphone.