What is the device now found on the plugs of such appliances as hair dryers?

The large box-like device found on the ends of some appliance cords could be an appliance leakage circuit interrupter (ALCI), an immersion detection circuit interrupter (IDCI) or a ground fault circuit interrupter (GFCI). Though they work in different ways, they all protect the user against accidental electric shock and electrocution by acting immediately to shut off power to the appliance upon the detection of a "leak" of electric current as may happen when a hair dryer falls into a sink full of water. Even with these devices, if that happens, unplug the device or shut off power to the circuit before reaching in to retrieve the appliance.

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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?