What is the unit that measures the total quantity of electrons passing a given point?

• A. Amperes
• B. Volts
• C. Ohms
• D. Coulombs

Answer: (D)

The unit that measures the total quantity of electrons passing a given point is the Coulomb. One Coulomb is defined as the amount of charge transported by a constant current of one ampere in one second. This makes it a direct measure of electrical charge, which is fundamentally related to the flow of electrons.

In this context, when discussing electric current, the relationship between charge, current (amperes), and time is crucial. The current is the rate at which charge flows, indicating that the number of electrons passing through a specific point over a specific duration defines the total charge measured in Coulombs.

Other options serve different purposes in electrical measurement: Amperes quantify the flow of current, Volts measure electrical potential, and Ohms represent resistance. Each of these units plays a vital role in the broader context of electrical engineering and physics, but when specifically looking to measure the quantity of charge, Coulombs are the appropriate unit.