Electric transmission of energy and its transformation, subdivision, and distribution. A practical handbook (1894)
Kapp, Gisbert, 1852-1922 · New York, Van Nostrand · leaf 56
he distance ; and the direc-tion of which is at right angles to the plane passingthrough the element and through the magnet pole. The ABSOLUTE MEASURE3IENT8. 41 force due to the element, d I, situate at b, is therefore f, and its amount is d F = ^ c. dl. m. + r The horizontal component of this… … If the magnet pole lies in the centre of the coil, d = 0,and the force is evidently H = ~——— . This equation provides another definition for unitcurrent. It will be seen that if m^ r and c are equal tounity, H is equal to 2 tt, and we may define unit currentas that current which, flowing in a wire…
Electric power production
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