The first extension cord was invented by Harvey Hubbell in the late 19th century. Hubbell, an American inventor and entrepreneur, patented various electrical devices, including the detachable plug and early versions of electrical connectors. His innovations laid the groundwork for modern extension cords.

Early History of the Extension Cord:

• Before 1900: Electricity was still relatively new, and most appliances were hardwired into electrical systems.
• 1904: Harvey Hubbell patented the first detachable electrical plug, making it possible to connect and disconnect devices safely.
• 1920s-1930s: As electricity became more widespread, manufacturers began producing flexible, insulated cords that allowed people to extend electrical connections beyond wall outlets.
• Mid-20th Century: Rubber and plastic insulation improved durability and safety, leading to mass production of extension cords in various lengths and designs.

Today, extension cords are made with multiple safety features, including surge protection, grounding, and circuit breakers, making them a staple in households and workplaces worldwide.