Have you ever walked out to check the mail or to a neighbor's house and heard an odd little buzzing noise when you approached a power line or transformer? Did it make you worry that something may be wrong, or were you just a little confused about why it was making noise? The truth is: it is a very commonly heard noise
Why do power lines make noise when it is really hot outside? - Quora
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Why do high-voltage power lines crackle and hiss? - BBC Science Focus Magazine
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Sparking power line, Garrett's blog Sparking power line
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