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A power supply is generally only converting the mains voltage down to a lower voltage suitable for low voltage equipment.

It turns 120 v into 18v or 12v or 5v or any other voltage it is specified for.

In most countries outside US, we have 220 volt AC in the mains.

Power is however power. One could say that Voltage is the speed of which the power run.

A power supply generally slows down the speed of electricity.

Regards.

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