Ohm's Law states that the voltage across a conductor is directly proportional to the current flowing through it, and the constant of proportionality is the resistance.
The equation is: \[ V = I \times R \] where:
- \( V \) is the voltage,
- \( I \) is the current,
- \( R \) is the resistance.
Thus, the correct answer is: \[ \boxed{(A) \, V = I \times R} \]