. The diagram in fig. shows a three pin plug


The diagram in fig. shows a three pin plug.

Label the three pins.

three pin plug

(a) Why is top pin thicker and longer than the other two?

(b) Why are the pins splitted at the ends?

 

Best Answer

The three pins in the plug are labelled as E, L and N

three pins in the plug

Here E signifies the earth pin,

L is for live wire and

N is for neutral wire

(a) The earth pin is made long so that the earth connection is made first. This ensures the safety of the user because if the appliance is defective, the current passes to the earth as soon as the live pin gets connected and the fuse blows off. The earth pin is made thicker because even by mistake it cannot be inserted into the hole of the live or neutral connection.

(b) The pins are splitted at the ends to provide a spring action so that they fit in the socket holes tightly.

 

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