What is the science behind the electric guitar?

Answer 1

The sounds of an acoustic guitar do NOT come directly from the strings. The vibrations of the strings travel through the bridge into the soundboard (top, or whatever you want to call the part with the sound hole) and the waves created by the air coming in and out of the sound hole create the sound you hear. In an electric guitar the strings create a magnetic wave by waving over the pickups which are just high tech magnets that transfer the electrical signal to you lead.

Answer 2

all guitars create sound using the vibration of the strings. on acoustic Guitars the vibrations from the strings travel through the hollow body and make it loud without being plugged in. electric guitars use pickups that either have magnetic poles or rails that pick up the vibrations from the strings and amplify them when the guitar is plugged in.

Answer 3

The stings frequency varies depending on how short or long the string is when played.

That frequency excites the magnetic poles and windings around it and sends small voltage signals to the amplifer that boosts the signal so you can hear it. Same concept as the telephone.