An internal power supply is essential for electronic devices and computer systems. It provides the electrical internal power required for the device's operation. It converts the incoming AC (alternating current) power from an electrical outlet into the DC (direct current) power that the device's internal components rely on. Usually situated within the device's chassis or casing, the internal power supply ensures consistent and reliable power delivery, ensuring the device functions smoothly. It comprises components like transformers, capacitors, rectifiers, and voltage regulators that regulate and distribute power to the internal computer. The primary objective of the internal power supply is to deliver steady voltage levels to different parts of the device, including the motherboard, hard drives, graphics cards, and peripherals. This precision in power delivery ensures the optimal functioning of each component and safeguards against damage caused by voltage fluctuations or surges. Internal power supplies come in diverse form factors and power ratings tailored to meet specific device requirements. They often provide multiple output connectors and cables to accommodate various devices and peripherals. Furthermore, modern internal power supplies are designed with energy efficiency as a priority, minimising power wastage and reducing their environmental impact. When selecting an internal power supply, users should consider factors such as wattage rating, energy optimization, and output rails.