Final answer:
The basic unit of electrical quantity is the Coulomb, which is the unit used to measure electric charge, and corresponds to the amount of charge transported by one ampere in one second.
Step-by-step explanation:
The basic unit of electrical quantity is the Coulomb (C). A Coulomb is the unit of electric charge and represents the amount of charge transported by a constant current of one ampere in one second. It's worth noting that the charge of a proton is +1.6 × 10⁻¹⁹ C, and the charge of an electron is -1.6 × 10⁻¹⁹ C. Moreover, electric current, which is central to many discussions on electricity and measured in amperes, is the rate at which charge flows past a point in a circuit. To reiterate, one ampere is equivalent to one Coulomb per second.