How do machines like MRI that use large freely rotating pieces with sensors and tools attached deliver power and send/recieve data, I don’t think they would have miles of cables on a spool thats ready to be wound back and forth?
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slip rings! picture electric trains that get power from overhead cables or a third rail on the ground. a metal wheel or brush touches those, and despite the fact that they move in relation to each other, power is moved through the point where they touch. now picture taking one of those tracks and making a circle. no matter how much it spins, the metal contact will be dragging along the surface of that rail, transferring power. slip rings usually have 2+ metal rings, and usually a metal spring pushing down on them for moving the power
[wikipedia has as great illustration of the two main types](https://en.wikipedia.org/wiki/Slip_ring#/media/File:SlipRings.jpg)
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