GK
PHYSICS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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It serves as a backup to the hot wire.
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It lets the appliance run if the neutral wire breaks.
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It connects the case of the appliance directly to ground for safety purposes.
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Nothing electrical, it is for mechanical sturdiness.
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Detailed explanation-1: -Household 120-V outlets are made to accept three-pronged plugs. One of the prongs attaches to the “live” wire at 120 V, and another attaches to the “neutral” wire that is connected to ground. What is the round third prong for? It connects the case of the appliance directly to ground for safety purposes.
Detailed explanation-2: -The standard 3-prong receptacle is called a grounding receptacle because it allows a grounding wire to be connected from the electrical circuit to the appliance. The grounding wire is connected to the third prong of the plug.
Detailed explanation-3: -The high voltage (about 120 volts effective, 60 Hz AC) is supplied to the smaller prong of the standard polarized U.S. receptacle. It is commonly called the “hot wire". If an appliance is plugged into the receptacle, then electric current will flow through the appliance and then back to the wider prong, the neutral.
Detailed explanation-4: -The third prong on an electrical cord is the ground plug. Since plenty of cords have only two, it may not seem terribly important-but according to national electric code, it’s an important safety feature that could save your life. Literally.