How does a three-prong plug work? What is the benefit of using it?

The third prong on a plug provides a path to ground for electricity that is straying or leaking from a product. This helps protect the equipment and can help prevent electric shock. Consumers should never remove or bend the third prong to fit a two-slot outlet. An adapter may be used safely only if the grounding wire or tab is physically connected to an electrical ground. A safer approach is to find or have installed an appropriate three-slot outlet.

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1. What are the latest statistics on residential electrical safety injuries?
2. How can consumers help protect themselves from electrocution and electrical-related injuries?
3. If you have an old house with old wiring, how do you know if repairs are necessary? How extensive and costly can such repairs be?
4. How does a three-prong plug work? What is the benefit of using it?
5. How does a polarized plug work? What is the benefit of using it?
6. What is the device now found on the plugs of such appliances as hair dryers?
7. What size extension cords should a consumer use? How can you tell if an extension cord is appropriate for the intended use?