[logtempo]

2. It's a good analogy. Waterfall are falling because of gravitational potential energy, just like an electron would fall when put in an electric field.

At constant height, a dam on the moon have less potential energy than an actual dam.

And gravity is a potential: https://en.wikipedia.org/wiki/Gravitational_potential "It is analogous to the electric potential with mass playing the role of charge."

[Neywiny]

If you read the Wikipedia you linked you'll see that gravitational potential != gravity. So no. If the author had said voltage is analogous to gravitational potential, sure. But they didn't. They said gravity. Here's the page for gravity: https://en.wikipedia.org/wiki/Gravity which brings with stating gravity is a force. Not a potential.

[logtempo]

Okay, I agree. I think we can also agree that author is not a physicist and he just didn't think further. To me, the comparison can be understood. If he reads the comment he should correct the error.

[prdpx7]

yeah! voltage is not gravity. i might have wrote that in my flow.