An electrical adapter modifies a three-prong plug to fit into a two-slot outlet. These devices are commonly available at home improvement retailers. Their intended use is to allow appliances or devices with three-prong plugs, designed for grounded electrical systems, to be used in older buildings or locations with only two-slot, ungrounded outlets.
The implementation of grounding in electrical systems significantly enhances safety by providing a path for stray electrical current to return to the source, thereby reducing the risk of electrical shock. The grounding pin on a three-prong plug connects to the grounding wire in modern electrical wiring, ensuring this safety feature. Adapters bypass this grounding mechanism, which can compromise safety if not used correctly. These adapters date back to a time when grounded outlets were not standard, but their continued availability reflects a need to accommodate older electrical infrastructure.