You could think of the "potential" as potential to do work. When you have concentration gradients of ions, that is potential energy, like the elevator analogy.
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I haven't taken the time to actually watch these, but there are several videos on Khan Academy going over this and may be a great resource:
https://www.khanacademy.org/science/healthcare-and-medicine/heart-depolarization/v/membrane-potentials---part-1
At 1:57-3:00 of this video, it discusses chemical/ concentration gradient and electrical gradient and how they get to equilibrium (resting membrane potential for potassium).
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