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An extension cord is a power supply utility that allows power to flow between a power source and a tool, appliance, electronic device or anything requiring electricity for operation. Extension cords are typically used for supplying power to RV's, motor homes, to garage equipment, tools like saws and a wide variety of other electricity-using devices. Extension cords vary in their length and ability to transmit power. Heavy duty extension cords are required for supplying larger amounts of power to larger appliances. For cold weather environments, some extension cords are made with high temperature tolerances.