Transformer Core

The core of the transformer houses the primary as well as secondary windings. The main function of the core is to provide a low reluctive path for the magnetic field. The core is made up of silicon steel laminations. The permeability of the core is kept very high so that all the magnetic lines of forces (magnetic flux) may link through the secondary winding.

Transformer

Transforemer is a static electrical device which transfers electrical power from one circuit to another without having any connection. It works on the principle of Faraday's law of electromagnetic induction. Transfer of energy took place due to mutual inductance between the two circuits(windungs).

The figure shown here depicts the opeartion.

There are a few things related to the transforemer, most of the engineers don't know.

Ques: Why transforemer is rated in kVA whereas all other electrical equipments like motors, mixers, drill machines etc are rated in KW.

Ans: Tansformer is an energy(or power) transferring device, its not a load. Whereas all others are load (i.e. suppose to consume electrical power and convert it into useful work). The transformer is supposed to transfer electrical power from primary winding to secondary winding without consuming any power. Therfore the power factor during the load condition can not be defined. Actually the power factor on load of a transformer is considered to be same as that of its load. So in absence of self power factor, the rating of transformer is defined in kVA and not kW (= KVA*power factor)

Electricity

Electricity is the flow of electrical power or charge. It is a secondary energy source which means that we get it from the conversion of other sources of energy, like coal, natural gas, oil, nuclear power and other natural sources, which are called primary sources. The energy sources we use to make electricity can be renewable or non-renewable, but electricity itself is neither renewable or non-renewable.
Its just an introduction. If anybody have any problem regarding electrical engineering. Ask me, I will try to solve it.