What is a Power Supply Unit (PSU)?

A Power Supply Unit (PSU) is an internal IT hardware component. Despite the name, Power Supply Units (PSU) do not supply systems with power - instead they convert it.
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Authentic Genuine Dell Original Equipment Manufacturer (OEM) Product Switching Power Supply Unit Slim DESKTOPS DT FF (NOT Small Form SFF) DTFF

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What Is PC's PSU (Power Supply Unit) & How It's Works? –

What Is PC's PSU (Power Supply Unit) & How It's Works? –

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Can I use this Dell server PSU as power supply unit for Christmas lights? : r/WLED