Well, when I asked before, people said that hydraulic or pneumatic systems are not apt analogies; because there is water, oil or water actually flowing. Now it's not the water that is the energy, it's the movement thereof, or the pressure. That's where the analogy starts to break down.

For reference, the first time I asked was here: http://physics.stackexchange.com/questions/2188/does-electri... (7 years ago - time does fly). There is a bunch of discussion there (also going into at what point a water analogy breaks down), and I'm not sure they agree with each other. I mean, another way of looking at it: you can encode n bits by charging (or not charging) capacitors. Does a series of capacitors encoding '0' have a lower mass than a series encoding '255'?

So yeah I don't really understand, still not after all those years. It's probably (in part) because I have not formulated one single yes/no question that is unambiguous or does not need any interpretation to be answered. Or maybe I'm just stupid.