How the Electric Guitar Works

This is a fairly good article on just how the electric guitar turns the string vibration into a sound coming out the amp,and some additional info.Like the function of tone controls,etc....
...By Matt Petronzio
Before that sweet sound can come through your speakers, a fascinating technological process takes place. Electric guitars essentially transform string vibrations into electromagnetic energy. The process is quick and simple to understand, but pretty impressive for a 1931 invention.

To understand how an electric guitar .....
http://mashable.com/2012/12/13/electric-guitar/