electric potential When does negative electric potential forms and what are its effect to the current?

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You can explore this idea with some experiments, or thought experiments!  Here is a link that describes the process.  http://www.physics.sjsu.edu/becker/physics51/elec_charge.htm

Just remember that electrons have a negative charge, smaller than the proton's positive charge!

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Any negatively charged object will create a field of negative electric potential around it that drops off with distance.  What drives a current is the difference in electric potential between one end of the wire and the other.  This is what we call the "voltage."  A greater voltage will produce a proportionally greater current in the circuit.

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