Question

Ampere=coloumb/sec, then how is it fundamental unit​

Answer 1

Answer:

ampere is the si unit of current

Explanation:

current is a physical quantity which is independent

just look at the physical quantity not its si unit

Answer 2

The ampere was chosen as a base unit, because it is easily measured whereas the coloumb is not. Interestingly, there is a move a foot to redefine the ampere (which will remain a base unit) in terms of the fundamental charge on an electron (not in terms of coulomb). I hope this answer is satisfying.

Remember, it is a modern concept that the unit ampere is the unit of electric current derived by the division of unit of charge and time but ampere can be defined in such a way that the definition doesn't necessarily includes charge, time, etc. So, just take it as a conventional fact that ampere is our base unit or fundamental unit even if ampere=coulomb/sec is totally true equation.