# Electric Power

As energy is the capacity for doing work, electric energy isrepresented by electricity in motion against a resistance. This possesses a species of inertia, which gives it a species of kinetic energy. To produce such motion, electro- motive force is required. The product of E. M. F. by quantity is therefore electric energy. (See Electric Energy)

Generally the rate of energy or power is used. Its dimensions are  ( ( (M^.5)*(L^.5) ) / T )  *   ( ( (M^.5) *(L^1.5))/( T^2) )  (intensity or current rate)   *  (electro-motive force or potential)   = (M * (L^2) ) / (T^3), which are the dimensions of rate of work or activity. The practical unit of electric rate of energy or activity is the volt-ampere or watt. By Ohm's law, q. v., we have C = E/R (C = current; E = potential difference or electro-motive force; R = resistance.) The watt by definition = C*E. By substitution from Ohm's formula we deduce for it the following values: ((C^2) * R) and ((E^2) /R). From these three expressions the relations of electric energy to E.M.F., Resistance, and Current can be deduced.