How does a double bass work?

Answer

A Bass Guitar fuctions in the same way that all types of electric Guitars do. The only thing that differentiates a bass guitar from a stardard Electric Guitar is the number of strings and the thickness of those strings.

Electric guitars (including bass guitars) are plugged into an amp. One end of the cord is plugged into the guitar, and the other end is plugged into an amp. Electricity goes through this cord and into the pickups of the guitar. (Pickups are the the raised-up things found on the body of the guitar under the strings at the part of the guitar where the strings are picked.) The electricity in the pickups creates an electro-magnetic field that senses the string movement and literally "picks up" the sound. The pickups sense the sound waves and send the message of those waves back through the guitar and down the cord again. This message goes into the amp and produces the audiable sound that you hear.