How does an electric guitar work?From where does an electric guitar draw power? In most guitars, cells are not used, so from where does it draw power?

An electric guitar is not one which produces too much
sound on its own like a conventional acoustic guitar would. Instead the strings of an
electric guitar produce an electric current due to the piezoelectric effect which is
used by the guitar amplifier to produce the actual sound. The strings of an electric
guitar are connected to what is called a magnetic pickup. These pickups are made by
wrapping coils of wire around a magnet. When the string is plucked, it results in a
current being induced in the coil, this current is different for each string and depends
on how the player has pulled it. The difference in currents is identified by the
circuitry in the guitar amplifier which then produces an appropriate
sound.

Electric guitars with this kind of construction are
able to produce much louder sounds which are also distinct from those of an acoustic
guitar. This has led to a complete revolution in music, with the new forms of music
coming up and the older ones getting modified.