Which equation correctly expresses Ohm's Law?

Which equation correctly expresses Ohm's Law?

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

Answer: (B)

Ohm's law shows how voltage, current, and resistance relate in a conductor: voltage is the product of current and resistance. So the expression that directly links voltage to the other two quantities is V = I × R. This makes sense because if you know the current and the resistance, you can multiply them to get the voltage; if you know voltage and resistance, you can rearrange to I = V ÷ R; and if you know voltage and current, you can rearrange to R = V ÷ I. The other option describes electrical power, P = V × I, which is a related concept but not Ohm's law itself.

Ohm's law shows how voltage, current, and resistance relate in a conductor: voltage is the product of current and resistance. So the expression that directly links voltage to the other two quantities is V = I × R. This makes sense because if you know the current and the resistance, you can multiply them to get the voltage; if you know voltage and resistance, you can rearrange to I = V ÷ R; and if you know voltage and current, you can rearrange to R = V ÷ I. The other option describes electrical power, P = V × I, which is a related concept but not Ohm's law itself.