Abstract

This chapter provides an overview of quantities and units. The International System of Units (SI) is the modern form of metric system agreed at an international conference in 1960. It has been adopted by the International Standards Organization (ISO) and the International Electrotechnical Commission (IEC), and its use is recommended wherever the metric system is applied. 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 into the meter-kilogram-second (MKS) unit system and these remain unaffected in the SI. The SI was developed from the metric system as a fully coherent set of units for science, technology, and engineering. A coherent system has the property that corresponding equations among quantities and among numerical values have exactly the same form because the relations among units do not involve numerical conversion factors. In constructing a coherent unit system, the starting point is the selection and definition of a minimum set of independent “base” units. From these, “derived” units are obtained by forming products or quotients in various combinations, again without numerical factors.

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