When electricity was first introduced into houses in the 1880s, it was primarily used for lighting. There are approximately 20 types in common use around the world, such as AC power plugs and sockets, and many obsolete socket types which are still found in older buildings.ĭevelopment Early history Lampholder plug from 1893 GEC Ltd (London) Catalogue JSTOR ( November 2023) ( Learn how and when to remove this template message).
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