WHAT IS OHM'S LAW? Probably the most important mathematical relationship between voltage, current and resistance in electricity is called "Ohm's Law". This formula is used to calculate electrical values so that we can design circuits and use electricity in a useful manner. Ohm's Law states that the voltage across a resistor is directly proportional to the current flowing through the resistance (V = R * I). Ohm's Law is named after German physicist Georg Ohm (1789-1854). WHAT IS SPECIAL ABOUT