SI and CGS Units Used in Electricity

Although only SI units are used in this book (see Policy on Units), it is important to remember some exact conversion factors between SI and CGS units since the remnants of obsolete CGS electrostatic units (esu) are still important in the technical literature on electricity especially as regards data contained in old treatises or technical specifications. 

Electric physical quantity and symbol(s) Symbol Dimension SI unit (symbol) CGS esu unit (symbol) esu cgs  

Current density j IL Ampere per square meter (1 A.m ) Franklin per second per square centimeter 1 A.m = (c/1000) Fr.s. cm 8 Insulators 

Current intensity I I Ampere (A) Franklin per second (Fr) 1 A = (10c) Fr/s Dielectrics 

Elastance S Reciprocal farad (F ) statfarad 1 F = (lOVc ) statfarad  

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