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Magnetic Formulæ Expressed in the M. K. S. System of Units

A. E. Kennelly
Proceedings of the American Philosophical Society
Vol. 76, No. 3 (1936), pp. 343-377
Stable URL: http://www.jstor.org/stable/984549
Page Count: 35
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Magnetic Formulæ Expressed in the M. K. S. System of Units
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Abstract

Electrical engineering literature employs the practical ohm-volt-ampere series of electromagnetic units so extensively that it might be often supposed to have been written in connection with the Giorgi M. K. S. system of units. The adoption of the Giorgi System by the International Electrotechnical Commission in June, 1935, therefore, introduces no change in the current literature of the voltaic circuit or of the continuous current electrical engineering circuit. Owing, however, to the action of the International Electrical Congress of Chicago in 1893, it is an almost universal custom to employ the C. G. S. magnetic system of units in the literature of the magnetic circuit for engineers. The following paper presents a number of electrotechnical formulæ for the magnetic circuit in M. K. S. units, together with arithmetical examples of their use, in the hope of aiding students to apply the M. K. S. System in magnetic-circuit computations. A number of these formulæ are independent of the question of "rationalisation." The formulæ which are affected by "rationalisation" are presented in both rationalised and unrationalised, or classical, form in parallel columns, so that the reader may choose between these two forms.

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