Electric guitars
Electric guitars make use of electronic pick-ups to amplify the vibrations of the guitar strings. They are usually connected to electric amplifiers. Electric guitars have a solid or semi-solid body type and they don't use the body for sound resonance so usually make very little or no sound when played without an amplifier. The concept used by electric guitars is that the energy of the strings is diverted into electrical impulses and not directly into sound so that they are able to achieve an amplified sound.
Electric guitars usually have control knobs for changing the volume or the tone of the guitar. There are also pick-up selectors in electric guitars and many electric guitars use multiple pick-ups to achieve the best guitar sounds. These pick-ups gather and produce different tones from the guitar. The tone knobs are used to shift from a bass-intensive sound to a treble-intensive sound or vice versa.
Some electric guitars also have whammy bars. These bars are attached to the guitar to shift notes without changing the finger positions on the fret board. Whammy bars are used to produce "crying" guitar sounds and are a very useful tool when performing rock and roll songs or even ballads. The use of the whammy bar in less expensive guitars is not advised because it may cause the strings to go out of tune.
