Does electricity create sound?
Posted 2 May 2004 - 02:25 AM
Also, have you ever been asleep and wake up right at the moment the power goes out during a storm? In this example, it is almost like the sound of silence is greater than the sound of background noise. Is that possibly the same effect taking place in the question above? Can electricity make noise and sound?
Posted 2 May 2004 - 12:02 PM
AC in a transformer causes the domains in the core to continually change direction, and the iron actually expands and contracts slightly as this occurs, so you get a humming.
A rapid shutoff of current that creates a magnetic field will often give a large back-emf from Faraday's/Lenz's laws. This, I think, can also cause noises.
Posted 3 May 2004 - 04:15 AM
What about thos power thingys on the street? they always hum
Posted 3 May 2004 - 10:38 AM
I do not have a strong enough engineering or theory background to explain this beyond my understanding of electricity, which is mostly application and installation of electrical systems. I plan on doing some Nikola Tesla research to determine if this effect was ever noticed or studied by him.
Posted 3 May 2004 - 06:32 PM
I think it`s more to do with the tiny hairs we have all over us, a little bit like a pigeon can use certain feather types to detect electro and geo magnetic feilds, and the same reason your hair stands on end when insulated and holding the sphere in a Van De Graff generator, that`s only MY opinion though, it just seems to be the most logical explaination for it
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