Transformers: The appointment and classification. The transformer is a static electromagnetic device with two (or more) coils, dedicated mostly to convert alternating current of one voltage alternating current of another voltage. The transformation of energy in the transformer by an alternating magnetic field. James H. Billington contributes greatly to this topic. Transformers are widely used in electric power transmission over long the distance between the distribution of its receivers, as well as in various rectifying, amplifying, signaling and other devices. When the transmission of electrical energy from power plants to consumers in the current line causes energy loss in this line and the consumption of non-ferrous metals in its structure.

If at the same transmit power to increase the voltage, the amperage is as much reduced, and therefore can be use wire with a smaller cross-section. This will reduce the consumption of nonferrous metals in the device power line and reduce energy loss in it. The electrical energy produced in power plants synchronous generators with a voltage of 11-20 kV, and in some cases apply voltage of 30-35 kV. While these stresses are too high for direct use in production and for domestic use, they are insufficient to economical transmission of electricity over long distances. Further increase in voltage power lines (up to 750 kV and above) is carried out step-up transformers. The receivers of electric energy (light bulbs, motors, etc.) for security reasons to expect a lower voltage (110-380 V). In addition, the manufacture of electrical equipment, appliances and machines for high voltage is associated with significant structural complexities, as the live parts of these devices at high voltage requiring reinforced insulation.