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Answer:
We can represent electric potentials (voltages) pictorially, just as we drew pictures to illustrate electric fields.
Electric field lines radiate out from a positive charge and terminate on negative charges.
While we use blue arrows to represent the magnitude and direction of the electric field, we use green lines to represent places where the electric potential is constant.
These are called equipotential lines in two dimensions, or equipotential surfaces in three dimensions.
Explanation: