I work near power lines. They’re above the parking lot. When I walk through the parking lot, I hear them buzz and crackle. Why do they crackle and buzz? What’s really happening up there? Specifically, what causes the crackling sound? I suggested to a co-worker that it might be arcing, but he was skeptical, since that’d be an awful lot of power being wasted.
Here’s a picture of the power lines I took on a walk a couple weeks ago: