A computer’s power supply is its lifeblood, providing the necessary voltage and current to power the system’s components. A power supply that is too small will not be able to fully power the system, and a power supply that is too large will waste energy and create excessive heat. In order to size a power supply correctly, you need to understand the system’s power requirements.

The power requirements of a computer are determined by the components that are installed in the system. The most power-hungry components are the CPU and the graphics card. Other components, such as the hard drive, …