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Modern two-prong electrical plugs have one prong that is larger than the other so that it receives positive electricity from one side and negative electricity on the other.

To a negatively charged body, on the other hand, the earth under the same circumstances gives off positive electricity.

But let a very small metallic ball with a charge of positive electricity upon it be brought moderately close to one face of the tinfoil.

Difference of electric potential between two points in an electric field was there defined as the dynamical work done in carrying a unit of positive electricity against the forces of the field from the point of lower to the point of higher potential.

It represents the work which would have to be done to bring a unit of positive electricity, against the electrical repulsion of the distribution, up to the point P from a point35 at an infinite distance from every part of the distribution; or, in other words, what we now call the potential energy of a charge q situated at P is qV.