https://www.khanacademy.org/science/physics/electricity-and-magnetism/v/electric-potential-energy
This video is a little lengthy for Khan Academy at 13 minutes, but it does a good job explaining this stuff in a different way than Mr. Rodriguez did.
http://www.studyphysics.ca/2007/30/06_forces_fields/12_voltage.pdf
Only a three page pdf file but it does a good job explaining the relation between gravitational potential energy and electric potential energy but the diving into the main topic in a very succinct way.
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