Transformer basic
from web site
Transformers are electrical devices consisting of two or more coils of wire used to transfer electrical energy by means of a changing magnetic field One of the main reasons that we use alternating AC voltages and currents in our homes and workplace’s is that AC supplies can be easily generated at a convenient voltage, transformed (hence the name transformer) into much higher voltages and then distributed around the country using a national grid of pylons and cables over very long distances.
The reason for transforming the voltage to a much higher level is that higher distribution voltages imply lower currents for the same power and therefore lower I2*R losses along the networked grid of cables. These higher AC transmission voltages and currents can then be reduced to a much lower, safer and usable voltage level where it can be used to supply electrical equipment in our homes and workplaces, and all this is possible thanks to the basic Voltage Transformer.
The Voltage Transformer can be thought of as an electrical component rather than an electronic component. A transformer basically is a very simple static (or stationary) electro-magnetic passive electrical device that works on the principle of Faraday’s law of induction by converting electrical energy from one value to another.
