...It "supplies the power" to whatever device you're referring to.
Baffling, I know.
Another answer:
A power supply converts 120V or 240V AC power (sometimes called "wall", "line" or "mains" power) into various regulated DC voltages needed in a piece of electronic equipment. In a computer, for example, the power supply will typically provide +12V, +5V, +3.3V and -12V sources to the various components. Voltage regulators in the power supply help keep the voltages steady, even when the input voltage sags.
UPS = Uninterruptible Power Supply
power supply is a device that supplies electric power to electrical load
any power supply with at least 175 watts
all about regulated power supply
Advantage of regulated power supply.
If it is a computer power supply it is the box that gives the computer its power from the outlet.
Power amplifierPower supply regulatorSwitching power supply chopperetc.
To keep the power supply cool. If there were no fan the power supply would overheat and fail.
When your computer will not power on. When the cooling fan of the power supply has failed. When the amount of hardware in use in your case exceeds the power capability of your power supply.
power supply is a device that supplies electric power to electrical load
DC Power is Direct Current Power Supply.
AT Power Supply - still in use in older PCs.ATX Power Supply - commonly in use today.ATX-2 Power Supply - recently new standard.