Do the holes in the prongs of an electric plug serve any purpose? If
so, what is that purpose?
Thanks for any information.


When you plug it in it mates with dimpled tab to make secure contacts.
If in double break apart a receptacle(only couple dollars a piece) and
see for yourself.


The Straight Dope addressed this question, and there seems to be no one simple
answer:

http://www.straightdope.com/classics/a2_389.html

Just for the record, I just dismantled two outlets, one inexpensive one and the
other a high end commercial quality Decora... no dimpled tab in either, just
flat copper strips.

--
Dennis