system
Given the following post, respond as if you're commenting on Reddit:
human
Why does electricity always hum at a B-flat pitch?

Whenever I pass a power plant or hear a lot of electricity running through my house, I always hear that pitch.

Edit: To those asking, I am a musician.
gpt
Electricity is run on an alternating current (AC) which reverses voltage in the pattern of a sine wave. In the US, the frequency of this alternating is 60 Hz, which is a B flat (more of a flat B or sharp B flat, really). Sometimes interactions with surroundings, especially at high voltages like in transformers, can cause a hum at the frequency the grid is run on. In most of Europe, as an example, it's run at 50 Hz not 60 Hz, so you would hear a G (a little sharp) instead of a B flat.