What unit is used to measure the flow of electrons over a specific period of time?

The correct unit used to measure the flow of electrons over a specific period of time is the ampere. An ampere, often simply referred to as "amp," is defined as one coulomb of charge passing through a conductor in one second. This definition highlights that the ampere quantifies the rate of electron flow, making it a fundamental unit in electrical engineering for understanding how much electric current is flowing in a circuit at any given moment.

The other units mentioned relate to different aspects of electricity. A volt measures electrical potential or voltage, which refers to the force that causes electrons to flow in a circuit but does not quantify the flow itself. A watt is a unit of power, which represents the rate at which energy is consumed or generated and is derived from multiplying volts by amps. An ohm measures electrical resistance, indicating how much a material opposes the flow of electricity. Thus, while these other units are essential in the realm of electrical engineering, they do not directly measure the flow of electrons like the ampere does.