### Expressing the Units of Electricity and Magnetism Directly in the MKS System

#### Abstract

Since the unit of electric charge can be chosen independently of the value of the permittivity of free space Îµ_{0}, it is shown that all electromagnetic quantities can also be assigned units *directly* in the MKS system.Â For example, the unit of electric charge can be 1 J as long as Îµ_{0} has units of 1 N.Â A table is given that makes a comprehensive comparison of the standard units in the Giorgi system with those in two such *direct MKS *schemes.Â A simple procedure is also described for changing the numerical values of the units in a systematic manner by dividing the various electromagnetic quantities into five distinct classes.Â This allows one to equate the value of Îµ_{0 }to 1/4Ï€, for example, similarly as for the Gaussian system of units, while still retaining the same formulas as in the Giorgi system. Â

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J. R. Reitz and F. J. Milford, Foundations of Electromagnetic Theory (Addison-Wesley, Reading, Massachusetts, 1960), p. 23

J. D. Jackson, Classical Electrodynamics (John Wiley and Sons,, New York, 1962), p. 133

J. R. Reitz and F. J. Milford, Foundations of Electromagnetic Theory (Addison-Wesley, Reading, Massachusetts, 1960), p. 368

T. Wilkie, New Scientist 27, 891 (1905)

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