lol, thanx x88x

It also helps to understand physics isn't intuitively scalar. The interactions of very small (like electronic) or very large (like weather) systems rarely work the same way as "medium" systems you can readily manipulate and comprehend. For my above example, imagine the cylinder of water is, say, a few inches wide (like a drinking glass), and imagine the differences in "water pressure" (voltage) when the height of that cylinder is increased not a few feet but a few miles. (The intensity of gravity is analogous to the "oomphf" behind the battery chemistry. Some chemical reactions just have more electrovoltaic potential than others, just as Earth and the Moon have different gravities which would affect the pressure measured at the bottom of the water cylinder.)