Which unit expresses the amount of electric charge passing a point in one second?

The unit that expresses the amount of electric charge passing a point in one second is indeed Amperes. This unit is a measure of electric current, which is defined as the flow of electric charge. One Ampere is equal to one Coulomb of charge moving past a specific point in one second.

Understanding this relationship is crucial in the study of electricity and circuits. While Coulombs represent the total quantity of charge, Amperes indicate how quickly that charge is flowing. Therefore, when discussing the rate of charge flow, Amperes becomes the relevant unit.

Other units mentioned serve different functions in the context of electricity. For instance, Volts measure electric potential or voltage, Ohms measure resistance in a circuit, and Coulombs provide a measure of charge itself, but not the rate at which it passes a point. Hence, Amperes is the appropriate choice for expressing the flow of electric charge per second.