Transformers are widely used both in the field of electricity and electronics. The use of transformers in the power system voltage allows choosing the appropriate and economical for every purpose, for example, the need for high voltage electric power transmission distance (power transmission). In the field of electronics, the transformer is used among other things as a coupling between the source and load impedance and also serves as a separator from one circuit to another circuit. Besides, it can inhibit the direct current while still continuing between the alternating current circuit. The working principle of a transformer is based on mutual induction between the two series are linked by magnetic flux. In the simplest form, a transformer consists of an inductive coil which is electrically separated but connected by a magnet path that has a low reflectance.