While the exact nature of electrici

While the exact nature of electricity is unknown, a great deal is known about what it can do. By the mere closing of a switch, buildings are lighted, wheels are turned, ice is made, food is cooked, distant voices are heard, and countless other tasks – ordinary and extraordinary – are performed. Although a great number of uses for electricity have been discovered and applied, the field is by no means exhausted. Electric machines and devices that have been in use for many years are being improved and are now finding wider fields of application. Extensive research is constantly bringing forth and developing new devices. Much is still to be learned about electricity.