Inside a custom-built computer: the power supply at the bottom has its own cooling fan.
A power supply unit (PSU) converts alternating current (AC) electric power to low-voltage DC power for the internal components of the computer. Some power supplies have a switch to change between 230 V and 115 V. Other models have automatic sensors that switch input voltage automatically, or are able to accept any voltage between those limits. Power supply units used in computers are nearly always switch mode power supplies (SMPS). The SMPS provides regulated direct current power at the several voltages required by the motherboard and accessories such as disk drives and cooling fans.
The SMPS provides regulated direct current power at the several voltages required by the motherboard and accessories such as disk drives and cooling fans.military grade power supplies
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