A power supply is a device that converts other forms of energy into electrical energy and provides electrical energy to circuits (electronic devices). The power source is based on the principle of \"magnetic generation of electricity\", which is generated by renewable energy sources such as hydraulic, wind, tidal, dam water pressure difference, solar energy, as well as electricity sources such as burning coal and oil residue. The common power sources are dry batteries (DC) and household 110V-220V AC power sources.
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