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Electric guitars are devices that generate sound from a set of pickups that convert string vibration into electrical signals for amplification. The sound starts out as vibrations the musician creates while playing. These vibrations are picked up by the pickups of the guitar. What are pickups? Pickups are permanent magnets wrapped around in a coil. Since the strings are made with a special material called ferromagnetic, they interact with the magnetic fields in the pickups and force electrons to move in the loop. Moving electrons can generate a signal that can be read by the amplifier.

Pickups work with a bar magnet which is rapped with turns of wire. We know that magnets with coil can transform electrical energy into motion. Also motion can be turn again into electrical energy. On a pickup, the vibration in the magnets is produces by the vibration that the ferromagnetic strings make. Then at the same time in the coil there is a vibrating current.
A knob on a guitar is considered a voltage divider. There is a relation between 2 resistors; all depends on the position. If the position is somehow there is no signal being resisted to ground, in that case there is full volume. The other situation is when it is fully turned all signals are shunted out to the ground so there is no volume.

Electric guitars function without any external power. The current is created by the vibrating strings that interact with the magnetic field and coils in the pickups since a force inside a magnetic field creates the current.

A knob on a guitar is consider a simple voltage divider. There is a ratio between 2 resistors; depending on the position there is no signal being resisted to ground, in this case there is full volume. The other situation...

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Barbour, Erik. "Vacuum Tubes. NETWe Carry over 5,000 Different Vacuum Tubes, in Stock!" How Vacuum Tubes Work. N.p., n.d. Web. 17 Mar. 2014.
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Sleight, Kenneth. "How Does a Potentiometer Work?" Brighthub Engineering. N.p., 09 Apr.
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