| AC Line Cord | The cord that connects the PSU to the AC power source. |
| AC Plug | The plug used to connect the PSU to an AC outlet. |
| Switch | The primary power control for the PSU. |
| Input Voltage Selector Switch | A switch allowing the PSU to operate in different countries with varying voltages. |
| Power Transformer | Convert the AC input power into one or more DC output voltages. |
| Output Connectors | Different cables and connectors supply power to the different components like the motherboard, CPU, hard drives, etc. |
| Ground | A common return path for electric current. |
| Fan | Used to cool the PSU, hence preventing it from overheating. |
| Fuse | A safety device, part of all power supply units, to prevent excessive flow of current which could lead to damage or fire. |
| Internal Circuitry | Various circuits and components used to convert and regulate the AC power into DC power. |
