Which expression represents Ohm's Law?

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

Answer: (C)

Voltage, current, and resistance relate through Ohm's Law: voltage equals current through the element times its resistance. This direct form, V = IR, captures the fundamental relationship and lets you solve for any one variable if you know the other two. The idea that current equals voltage times resistance isn’t correct, because the units don’t line up (current isn’t volts times ohms). While R = V / I is a valid rearrangement, the expression that perfectly represents the law in its standard form is V = IR. P = VI describes electrical power, which is a consequence of Ohm's Law but not the law itself.