I don't really understand ; finding the correct breaker will still not tell you what is actually causing the sound, will it? Especially not if you don't know where the circuits run throughout the house.
I don't think you're wrong. I guess the idea is that it's one more piece of data, and more data is always helpful. This would at least tell me for sure if the noise is caused by something that's on the same circuit as the stuff in my bathroom. If it isn't, then that's useful information. If it is...then I'm not sure what to do
Once you know what circuit is powering the noise source, you start pulling wiring connections in that circuit apart until you identify the single device that is the actual source.
Always leave the White and bare ground wires connected within the electrical boxes. Disconnect the selected power wire (typically black, sometimes red) with the breaker turned off. Then engage breaker, determine what has been disconnected (no longer has power) and whether the sound has changed.
Disconnect breaker again before inserting fingers or tools into the electrical box.
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