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Q & A: Power line hum

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Q:
I allways hear a voice like "zzzzz" from city power lines. No matter if it is rainy or not, or if they are wet or dry. Why and how they make a sound like that? And that sound is higher if the lines get wet. WHY?
- yasin (age 35)
ankara
A:

Here's what we found in a quick search.

http://en.wikipedia.org/wiki/Mains_hum
http://en.wikipedia.org/wiki/Corona_discharge


Mike W.

(published on 09/04/2010)

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