METRIC SYSTEM AND POWERS OF TEN Basic Electrical TheoryTABLE A-2SUPPLEMENTARY SI UNITSQuantityUnitSymbolPlane angle radian radSocid angle steradian SrThese base and supplemental units are used to derive other units. Most of the units of measureused in electricity are derived units. These units are shown on Table A-3. Some of these arederived from the base units, and some are derived from other derived units, or a combination ofboth. For example, the unit of current is the ampere, which is derived from the base units ofsecond and coulomb. The derivation of these units is beyond the scope of this text. However,units commonly used in the study and use of electricity and their relationship to other units ofmeasure are discussed in Chapter 3, Units of Electrical Measurement.ES-01 Page A-2 Rev. 0
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