Ohm's Law relates the voltage, current, and resistance in an electrical circuit using mathematical formulas. It states that the current through a conductor is directly proportional to the voltage applied and inversely proportional to the resistance. The document explains key electrical concepts like voltage, current, resistance and how Ohm's Law can be used to calculate these values in both series and parallel circuits. It also notes some limitations of Ohm's Law and discusses its practical applications in electrical engineering and circuit design.