Patent ID: 8870591

Claim:
A power supply system comprising: an identification adapter comprising: a case made of a transparent resin which is configured to transmit environment light, a socket which is provided on a predetermined surface of the case and configured for a power plug of an electrical device to be inserted onto the socket, an adapter plug configured to be inserted into an electrical outlet and which is provided on a surface different from the predetermined surface of the case to apply a current to the power plug of the electrical device via the socket, and configured to be inserted into another electrical outlet, and an identification mark which is provided near the adapter plug; and a power supply apparatus for identifying the identification adapter of which the adapter plug is electrically connected to an electrical outlet of the power supply apparatus, the power supply apparatus comprising: a housing in which a plurality of electrical outlets are formed, and a reading sensor that is provided for each of the electrical outlets in the housing and provided adjacent the electrical outlet of the power supply apparatus, wherein the reading sensor uses a change in a light volume of environment light which is transmitted through the case to read the identification mark.