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by sethammons 721 days ago
This veritasiun is relevant, complete with reddit discussion:

https://www.reddit.com/r/engineering/comments/qxrsrp/the_big...

What if you made a really big circuit consisting of a battery, switch, lightbulb, and a wire that goes out 300k km on either side making a circuit that should take 1s at the speed of light to travel through. How long after closing the switch will it take for the light to go on?