Ohm's law states that the current through a conductor between two points is directly proportional to the potential difference across those points. Which option describes this relationship?

• A. The current is inversely proportional to voltage.
• B. The current is inversely proportional to resistance.
• C. The current is directly proportional to voltage.
• D. The power is proportional to current squared.

Answer: (C)

Ohm's law shows how current relates to voltage across a conductor: I = V / R. When the resistance stays the same, the current changes in direct proportion to the voltage. So, if you double the voltage, the current doubles as well.

The best description here is that the current is directly proportional to voltage. That matches the idea that I ∝ V when R is constant.

The other phrasings don’t describe this specific relationship. Saying the current is inversely proportional to voltage would imply higher voltage gives lower current, which isn’t correct. Saying the current is inversely proportional to resistance is true for a fixed voltage, but it’s about resistance, not the direct link between current and voltage. And describing power as proportional to current squared talks about a different quantity (P = I^2R) rather than the direct I–V relationship.