The electrical unit that refers to the number of electrons moving through a circuit per second is Ampere (A), also known as Amp.

Here's why:

* Ampere is the SI unit of electric current.

* Electric current is the flow of electric charge, which is carried by electrons.

* One Ampere is defined as the flow of one Coulomb of charge per second.

So, a higher Amp value means more electrons are moving through the circuit per second.