Whereas in basic mathematics, the science of quantity, units are not of primary importance the fundamental properties of arithmetic, algebra, geometry, trigonometry, dynamics, etc, are not dependent upon the existence of any particular set of units. For instance, the Pythagorean theorem relating the squares on the sides of a right-angled triangle, would be true in Euclidian geometry for any units of length. The progress and extension of the electric telegraph made it essential for those responsible for the construction and operation of the lines to have a practical knowledge of the system. It became clear, however, that there was a large gap between the students' knowledge of the discoveries of Volta and Galvani, of Oersted and of Faraday, and the work of the practical electricians who had to obtain practical results by communicating their knowledge to others. The development of electrical units and measuring standards from their inception in the 19th century is directly linked with advances made in scientific and engineering applications.

Inspec keywords: electric variables measurement; units (measurement); telegraphy; measurement standards; geometry

Other keywords: knowledge discovery; trigonometry; engineering application; geometry; electrical measuring standard; right angled triangle; electrical unit; Pythagorean theorem; Euclidian geometry; electric telegraph; electrical measurement

Subjects: Electrical instruments and techniques