Which expression correctly represents Ohm's Law?

Which expression correctly represents Ohm's Law?

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

Answer: (A)

Ohm's Law shows how voltage, current, and resistance relate to one another. The voltage across a conductor equals the current through it multiplied by its resistance, so the correct expression is V = I × R. This form directly ties the three quantities together and lets you solve for any one if you know the other two. For example, if you know V and R, you can find I with I = V / R, and likewise R = V / I. The other expressions don’t represent the same relationship: I = V × R would mix units incorrectly, while P = V × I describes electrical power (a related concept) rather than the basic Ohm’s Law relationship. V = R / I is not dimensionally correct for resistance.

Ohm's Law shows how voltage, current, and resistance relate to one another. The voltage across a conductor equals the current through it multiplied by its resistance, so the correct expression is V = I × R. This form directly ties the three quantities together and lets you solve for any one if you know the other two.

For example, if you know V and R, you can find I with I = V / R, and likewise R = V / I. The other expressions don’t represent the same relationship: I = V × R would mix units incorrectly, while P = V × I describes electrical power (a related concept) rather than the basic Ohm’s Law relationship. V = R / I is not dimensionally correct for resistance.