Question

why do we remove the plastic coating from ends of an electric wire while using it for connection in an electric circut

Answer 1

because if we don't remove it, then electric current will not pass through it

Answer 2

Hey buddy
Here's your answer
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We remove that plastic coating as the plastic is an insulator (bad conductor) of electricity and it will doesn't all electricity to pass through it .
-------------------------------------------------------- There are many ways to remove that plastic coating . I mentioned some of them here :-
1.) Using Plier - Use the cutter provided in the plier to cut the plastic part at some extent . Make a mark and then you can get the part off yourself with hands.

2.) Using knife - You can also use a knife to cut that plastic coating . Just cut that part with a little pressure and a mark will be made there. You can then use your hands to remove it.
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Hope this helped you , if so then pls mark my answer as brainliest :-)
Greetings
Kushagra