Voltage is the driving force that pushes charges to move through a circuit.

Voltage is the driving force that pushes charges to move through a circuit.

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

Answer: (B)

Voltage is the electric potential difference that provides the push to move charges through a circuit. It’s like pressure in a hose: the greater the pressure difference, the more push there is to drive water through. The actual flow of charges is the current, and it depends on how easy it is for charges to move, which is determined by resistance. Ohm’s law ties these together: current equals voltage divided by resistance. So, with a given resistance, higher voltage means more current; with higher resistance, the same voltage yields less current. Power is related too—it’s the rate energy is delivered, calculated as voltage times current (or as I^2R). Also, voltage can exist without current if the circuit isn’t closed, but the statement highlights voltage as the driving force that makes current possible, which is why it’s the correct idea here.

Voltage is the electric potential difference that provides the push to move charges through a circuit. It’s like pressure in a hose: the greater the pressure difference, the more push there is to drive water through. The actual flow of charges is the current, and it depends on how easy it is for charges to move, which is determined by resistance. Ohm’s law ties these together: current equals voltage divided by resistance. So, with a given resistance, higher voltage means more current; with higher resistance, the same voltage yields less current. Power is related too—it’s the rate energy is delivered, calculated as voltage times current (or as I^2R). Also, voltage can exist without current if the circuit isn’t closed, but the statement highlights voltage as the driving force that makes current possible, which is why it’s the correct idea here.