One of the things I’d love to do is measure the AC mains grid frequency with fairly high precision. We know that it’s kept at 50 Hz long term, so that old mains-powered alarm clocks, etc. can keep track of time by simply using AC mains as their input time source.
But at the same time, there’s a well-known effect with generators, which causes them to slow down when the load is high and speed up when the load is low.
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