Inductor consists of one or more turns of wire and typically having two terminals. They are usually connected into a circuit in order to raise the induction to a desired value. An inductor stores energy in the form of a magnetic field. For railway applications inductors are used for power and auxiliary circuits of electric vehicles. Power inductors are used for switch mode power supply applications. High frequency inductors, like micro-inductors are ideal in HF circuitry for mobile phones, pagers and cordless equipment as well as wireless designs. Large inductors are used in the power supplies of electronic equipment of all types, including computers and their peripherals. Inductors are available in a variety of ranges differing in space availability, frequency range operation and power requirements. Coupled inductors, Multi layer inductors, Ceramic core inductors, Molded inductors are some of the kinds of inductors.