in air from a similar and equal quantity, repels it with a
mechanical force of one dyne. Similarly, potential is measured
by the work done in moving a unit of + electricity against the
mechanical forces exerted upon it, unit difference of potential
existing between two points when it requires the expenditure of
one erg of work to bring a unit of positive electricity from one
point to the other against the forces exerted on it. Now, it will
be remembered that work is defined as the product of force
by the distance through which the force is overcome, and, there-
fore, if the difference of potential between two points is the
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