A transformer is an electronic device that takes electricity of one voltage and transforms it into a new voltage. Transformer which is brought in use of can be positioned into two wide categories: power supply and signal matching. A transformer is completely based on an extremely straightforward details regarding electricity: when an unequal electric current run through a wire, it creates a magnetic field everywhere around it. The power of the magnetism is straightly linked to the size of the electric power. So the higher the voltage of the current, the stronger is the magnetic field. When a magnetic field changes around a part of wire, it produces an electric current in the wire. As a result if we place a second coil of wire at the side of the first one, and send a changeable electric current into the initial coil, by this we will be able to generate an electric current in the second wire which is termed as electromagnetic induction for the reason that the current in the initial coil bring on a current in the next coil. The current in the initial coil is generally termed as the primary current and in the second wire is the termed as the secondary current.