Question

What is the SI unit of electric charge?

Answer 1

The S.I unit is the Coulomb (C)

Explanation:

It is approximately `6.242*10^18` e (e being the charge of a proton)

Answer 2

The SI unit of quantity of electric charge is the coulomb.

Explanation:

The coulomb, `"C"`, is derived from the fundamental SI unit of time, the second, `"s"`, and the fundamental SI unit of electric current, the ampere, `"A"`. It is the charge `("Q or q")` transported by a constant current of one ampere in one second.
`"1 C"="1A"*"s"`

A coulomb is equivalent to the charge of approximately `6.242xx10^18` protons, or `1.036xx10^(−5)` mol of protons. Each proton has an elementary charge of `+1e`.

https://en.wikipedia.org/wiki/Coulomb