What term describes the difference in electric potential between two points?

• A. Current
• B. Voltage
• C. Resistance
• D. Power

Answer: (B)

Voltage is the difference in electric potential between two points. This potential difference tells you how much energy per unit charge would be gained or lost as a charge moves from one point to the other. It’s the driving force that pushes charges through a circuit, so larger differences push more current through a given path. The unit is the volt, often described as electrical pressure that motivates current flow. For context, current is the flow rate of charges, resistance is what oppose that flow, and power is the rate at which energy is transferred (power equals voltage times current). For example, a 9-volt battery created between two terminals will drive current through a circuit; if 1 amp flows, the circuit delivers 9 watts of power.