In a three prong plug one flat prong carries current from the supply that enters the electrical outlet and the other returns to carry to the service panel of the building around crying helps protect people from electrical shock one has a purpose similar to that of the round Prong

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The flat prong in a three prong plug is called the "hot" prong, and it carries the current from the power source into the electrical outlet. The other flat prong is called the "neutral" prong, and it returns the current back to the service panel of the building. The purpose of the round prong, which is called the "ground" prong, is to provide an extra layer of safety by helping to protect people from electrical shock.

To better understand the roles of each prong, it is helpful to have a basic understanding of electrical circuits. In a typical electrical circuit, the hot wire carries the flow of electricity from the power source to the electrical devices or appliances being used. The neutral wire, on the other hand, provides a safe return path for the current back to the power source.

The ground wire, or the round prong in a three prong plug, serves as a safety measure to prevent electrical shocks. It is connected to the ground or the earth, usually through a grounding rod installed outside a building. In the event of a fault or a short-circuit in an electrical device, the ground wire provides an alternate path for the excess electrical current to safely flow into the ground. This helps prevent the user from getting shocked in case of electrical malfunction or exposure to live wires.

Having all three prongs - hot, neutral, and ground - in a three prong plug ensures that the electrical device is properly connected and grounded, maximizing safety. It is important to always use grounded plugs and outlets to avoid the risk of electric shock and other electrical hazards.