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How Does an AC-DC Adapter Work?
The AC to DC adapter or external power supply consists of a power supply which is enclosed in a housing similar to an AC plug, hence the term plug type, wall plug in, plug-in or plugtop power adapter. The power supply is plugged into the mains socket and the AC Voltage is then converted by the AC to DC adapter power supply into a DC voltage that is fed into the appliance via the output cable connection.