On Paper: Wall Adapters for Power
Wall Adapters have an input voltage generally between 110v or 220v. This voltage may read 115v, 120v, 230v or 240v. the output voltage will vary widely. This usually depends on the application of the wall adapter. If the wall adapter was used for another device, the wall adapter was designed and manufactured to power that device safely.
The output will be shown in DC or AC voltage and amperage. Voltage is the rating that the wall adapter will provide the circuit, and the amperage is the maximum value that the wall adapter allow. That is to say, if a device normally draws (pulls as having a load) 5 amps, but the wall adapter can only allow a 2 amp draw, then the device will only get a load of 2 amps.
Examples of common values for voltage and amps: 9v, 12v, 1000ma (1A), 250ma. Amp is 'A' and milliamp is 'ma'.
If the output is AC (Alternating Current) voltage, the wall adapter is just a step up or step down voltage converter. If the output voltage is DC (Direct Current), then this would be called an AC to DC converter.
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