Slip rings were mentioned in passing in this video about mowing a lawn using a laser. I've often wondered how electrical connections are passed through a rotating joint, and it turns out this is how!! 🤯
The wikipedia pages for this also mentioned wireless slip rings, which sounds to have limited application for energy transfer, but is still effective for data connections. Though I can't help but wonder what the range on such a device would be. This could be an interesting attack vector relative to device security 🤔