Which statement best describes the relationship between current and electrons in a conductor?

Which statement best describes the relationship between current and electrons in a conductor?

• A. It implies the current is independent of electrons.
• B. More electrons passing a point yields greater current.
• C. Fewer electrons yields greater current.
• D. Current is determined by voltage only.

Answer: (B)

Electric current is the rate at which electric charge passes a point in a conductor. In a metal, the charge carriers are electrons, so the current grows whenever more electrons cross that point each second. If more electrons flow per unit time, more charge moves per unit time, and the current increases accordingly. The direction of electron flow is opposite to the conventional current, but the size of the current tracks the electron flow rate. The other ideas don’t fit because current is not independent of electrons, it does not increase with fewer electrons, and it isn’t determined by voltage alone—the current also depends on how readily charges can move, which involves resistance (I = V/R).

Electric current is the rate at which electric charge passes a point in a conductor. In a metal, the charge carriers are electrons, so the current grows whenever more electrons cross that point each second. If more electrons flow per unit time, more charge moves per unit time, and the current increases accordingly. The direction of electron flow is opposite to the conventional current, but the size of the current tracks the electron flow rate. The other ideas don’t fit because current is not independent of electrons, it does not increase with fewer electrons, and it isn’t determined by voltage alone—the current also depends on how readily charges can move, which involves resistance (I = V/R).