Why cuts /splits on the plug ?

 Today we will know the correct answer to why there are cuts on the pulgs. Before that you should know that which type of  pulgs have cuts ? All types of plugs have not cuts /splits . 

Plug :

Plug is a device for making an electrical connection between an appliance and the mains, consisting of an insulated casing with metal pins that fit into holes in a socket.

  The cuts are only in plugs which are made from brass material.

Why cuts are only in plugs made from brass material?

Brass is a good conductor of electricity . But if high amount of current passed through it , it get expanded . 

Expansion ➡️ (depends on) current

(The Pins are made of brass sometimes coated with nickel to avoid the common rust. Therefore white in colour.)

Brass has high coefficient of thermal expansion. So if the temperature of the pins go up(for any reason), it would be very difficult to pull out the plug because inside the socket ,the plastic sockets can get jammed due to thermal expansion.

To control this situation,the cuts are made to reduce Area of plug . We know the inverse relation of resistance and area .

R= p( l / A )

      p : Resistivity 

       l : length of Conductor

      A : Area of Conductor

        

 Hence as resistance increases current flow decreases . As current decreases , the expansion also decreases. 

Expansion ➡️ (depends on) current

What is brass ? 

Brass is an alloy of copper and zinc, in proportions which can be varied to achieve varying mechanical and electrical properties.It is a substitutional alloy: atoms of the two constituents may replace each other within the same crystal structure.