Which quantity is described by the driving force that causes electrons to move?

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

Answer: (D)

Voltage is the driving force that pushes electrons through a conductor. It’s the electrical potential difference between two points, like pressure pushing water through a pipe. A battery or power source creates this potential difference, and the resulting push causes charges to move, producing current. The stronger the voltage (for a given resistance), the more current flows, as described by I = V/R.

Current is the actual flow of charge, not the cause of it. Resistance is what opposes the flow, not what drives it. Power is the rate at which energy is transferred, which depends on both voltage and current.