Which statement defines current?

• A. The potential difference between two points in a circuit.
• B. The energy stored in a battery.
• C. The rate of movement of electric charge (flow of electrons), measured in Amperes.
• D. The resistance of a conductor.

Answer: (C)

Current is the rate at which electric charge moves through a circuit. Think of it like how much water passes a point in a pipe each second—the bigger the flow, the higher the current. The charge moving here is carried by electrons, and the total amount of charge passing a point per second is measured in amperes, with 1 ampere equal to 1 coulomb per second. The reason this is the right description is that current tells you how much charge is flowing, not how much energy is stored (that’s related to the battery’s energy), nor the push that moves the charges (voltage), nor the opposition to flow (resistance). It’s also useful to note that electrons move in one direction, while conventional current is defined as the flow of positive charge in the opposite direction, but the magnitude of current remains the same.