A linear or switched-mode power supply (or in some cases just a transformer) that is built into the top of a plug is known as a "wall wart ", "power brick", "plug pack", "plug-in adapter", "adapter block", "domestic mains adapter" or just "power adapter". They are even more diverse than their names; often with either the same kind of offering different voltage or polarity, or a different plug offering the same voltage. Universal adapters attempt to replace missing or damaged ones, using multiple plugs and selectors for different voltages and polarities. Replacement power supplies must match the voltage of, and supply at least as much current as, the original power supply. |
