Power systems are used to generate, transmit, and distribute electrical energy to homes, industries, and commercial buildings. They can be broadly classified into single-phase and three-phase systems. In a single-phase system, the electric power is carried by a single alternating current (AC) waveform. It is commonly used in residential and small commercial applications because it is simple and cost-effective for lower power requirements. On the other hand, a three-phase system uses three alternating currents that are phase-shifted by 120 degrees from each other. Three-phase systems are more efficient for transmitting large amounts of power over long distances and are widely used in industrial and commercial settings due to their ability to handle higher loads and provide a more stable and balanced power supply. Transformers play a crucial role in power systems by increasing (step-up) or decreasing (step-down) voltage levels to ensure efficient transmission and distribution of electrical power. Step-up transformers increase the voltage for long-distance transmission, reducing energy loss, while step-down transformers decrease the voltage for safe use in homes and businesses. Understanding these components is essential for designing and maintaining efficient and reliable power systems.