Abstract

This chapter discusses quantities and units. The International System of Units (SI) is the modern form of the metric system agreed at an international conference in 1960. It has been adopted by the International Standards Organisation (ISO) and the International Electrotechnical Commission and its use is recommended wherever the metric system is applied. SI units and the rules for their application are contained in ISO Resolution R1000 and an informatory document SI-Le Système International d’Unités, published by the Bureau International des Poids et Mesures. The adoption of SI presents less of a problem to the electronics engineer and the electrical engineer than to those concerned with other engineering disciplines as all the practical electrical units were long ago incorporated in the metre–kilogram–second unit system and these remain unaffected in SI. The SI has seven base units, and two supplementary units of angle. Certain important derived units have special names and can themselves be employed in combination to form alternative names for further derivations. The base units are length, mass, time, electric current, thermodynamic temperature, luminous intensity, and amount of substance.

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