standard of derived quantities
capasitive standards
c = c/v
capasitance of 1 farad when 1 coulumb of charge is stored due to one volt applied potential different across a plate
when there are difference in electric charge between the plate , an electric field is created in the region between the plate that is propotional to the amount of charge that has been moved from one plate to the other
this electric field creates a potential differnce v = Ed between the plate of the simple parallel- plate capasitor
inductive standards
inductive is an effect which result from the magnetic field that forms around a current-carrying conductor
electrical current through the conductor creates a magnetic flux propotional to the current
a change in tis current creates a change in magnetic flux that, in turn , generates an electromotive force(emf0 that acts to oppose this change of current
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