Extension Cord Using LED as Indicator Lamp

An extension cord comprising:

• a cable including a first end and a second end, with the cable including a plurality of conductive wires and an outer coating that sheathes the conductive wires;
• a plug formed on the first end of the cable, with the plug including a first insulating body and a plurality of prongs supported by the first insulating body and electrically connected to the conductive wires;
• a socket casing formed on the second end of the cable, with the socket casing including a second insulating body and a plurality of conductive plates mounted in the second insulating body and electrically connected to the conductive wires;
• and
• a lighting device mounted in one of the first and second insulating bodies of the plug and the socket casing, with the lighting device including a light-emitting diode electrically connected in parallel to the conductive wires and a DC converting circuit electrically connected to the light-emitting diode, with the DC converting circuit being adapted to convert an AC voltage from the plug into a DC voltage supplied to the light-emitting diode for lighting the light-emitting diode, and with light beams emitted by the light-emitting diode transmitting through one of the plug and the socket casing to show the extension cord and to indicate on/off state of the extension cord.