In our house, we use many electrical equipments.
They have different ways of connection. Some have 3 pin wires and some have 2 pin wires.
If the electrical appliance uses high current then it will have 3 pin wire. Like refrigerator, Air conditioner, water heater etc.
Some electrical equipment use less current to operate. They have 2 pin wire. Like TV, mobile phone charger etc.
Whether it is a 2 pin or a 3 pin plug, the circuit of current should be complete for the current to flow.
Current will enter through one pin from the mains. It is known as line.
It will leave the circuit through another pin. It is known as neutral.
For a simple circuit which draws less current, only these two pins are sufficient.
But for the circuit drawing large amount of current, for the safety of users, one more pin is provided.
That is earthing.
If somehow, circuit breaks, then the flowing current searches for the path with lesser resistance to flow.
At that time, if the user holds the appliance, then the current will flow through the user. That is us.
That's why no resistance earthing is provided. The current from the faulty circuit will directly flow into earth, keeping the user safe.
That is the difference between 2 pin and 3 pin plug.
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