Electrical Power Theory is the study of how electrical energy is generated, transmitted, and consumed. It involves understanding the relationships between voltage, current, and resistance, which are fundamental concepts in Ohm's Law. This theory helps engineers design efficient electrical systems and ensures that power is delivered safely and effectively. In AC (Alternating Current) and DC (Direct Current) systems, power can be calculated using different formulas. The total power in a circuit is often expressed in watts, and it can be divided into real power, reactive power, and apparent power. Understanding these components is crucial for optimizing electrical performance in various applications.