Each rack must safely deliver stable electrical power to dozens of servers, switches, and storage devices while maintaining reliability, airflow efficiency, and electrical safety. Power distribution inside a data center rack is more complex than many engineers expect. Modern infrastructures. From the utility grid to the server rack, Data Center Power Flow moves through multiple layers of protection, transformation, conditioning, and distribution to ensure uptime and reliability. They typically use 120V or 208V AC power converted to 12V/48V DC for equipment. It helps improve efficiency and control costs. Just like virtual CPUs (vCPUs) relate to physical CPUs in cloud computing, kW/rack defines power use per server rack. This impacts colocation pricing, energy use.