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how is ampere ( unit of current) fundamental unit? shouldnt it be derived ( Ampere = Charge/second )? also, why isnt coulomb (unit of charge )a fundamental unit? if it is a derived unit, what is the derivation of coulomb?

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Answer:The definition of the ampère is NOT derived from time and charge. Instead, the coulomb, as the COHERENT SI UNIT of charge is derived from the ampère and second as C = A · s. ... Even more so when we have a fundamental CONSTANT - the ELECTRONIC charge that it would seem sensible to base the unit on.

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