In Ohm's Law, which form correctly describes the relationship between voltage, current, and resistance?

• A. V = I * R
• B. I = V * R
• C. R = V / I
• D. P = V * I

Answer: (A)

The key idea is that voltage, current, and resistance are linked by a direct proportional relationship: voltage equals current through a resistor times that resistor’s resistance. This form shows clearly how voltage arises from both how much current is flowing and the opposition the material provides. If you know two of the quantities, you can find the third; you can rearrange to get current as V over R or resistance as V over I, which are mathematically equivalent, but the most straightforward expression of Ohm’s Law is V = I × R. The other options either mix the variables incorrectly or describe power (P = V × I) rather than the basic V–I–R relationship.