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The international system of units abbreviated as SI has been universally accepted for
international use in all fields of engineering and day to day requirements. Therefore, all business
and even household transactions are conducted in SI units. SI system offers the following
advantages over other system of units.
1. There is one and only one unit for each physical quantity. Therefore, a table of
conversions from one unit to another is not required.
2. The system is coherent with the derived units. The conversion factor from the original
unit to the derived unit is simply a multiplication or division by 1 .
3 . There are n o conversions between electrical and mechanical systems e.g. a motor or
an automobile engine is now rated as in kW rather than horse power. Energy is now
expressed in watt-sec rather than in Joule etc.
There are a large number of quantities (more than thirty) which an electrical engineer
deals in. However it is not necessary to assign a standard unit to each quantity as these quantities
are functionally related through experiments, mathematical derivation or definitions. The
minimum number of quantities required to express the units of all other quantities are known
as fundamental quantities. The following are the considerations for selection of fundamental
quantities. |
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