Easy to fit capacitance, inductance, and resistance into as well

Hell of a lot of electrons coming out and going in though

imagine a bicycle chain between two sprockets, if you crank it foward and back like 1 inch, over and over again, you can clearly transmit power without the chain links going much of anywhere

In 10MB ethernet days, they might have been directly driven by the signal on the wire. After that, they’re pretty much just “a flashing mechanism turned on when activity is present”