# Electrical Transformer – Basic construction, working and types

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### Electrical Transformer Construction, Working, EMF Equation

#### In this post we are going to learn about electrical transformer.we can say transformer as static induction motor.You know why we are using AC power instead of DC power in our power system,Because of so many advantages of AC power over DC power.One of main advantages of AC supply is transformation [changing one level to another level ].This transformation is possible by a static electrical machine called transformer. ### Construction of Transformer

#### 2.Magnetic Core of transformer :- This acts as a pipeline to carry the flux through it and delivers to the secondary winding.3.Secondary Winding of transformer :- the flux, produced by primary winding, passes through the core and cuts the secondary winding.So emf will induce in the secondary winding of transformer. ### Working Principle of Transformer

#### Let us understand in more easy way,assume there are two coils.Say first and second.Now we are supplying voltage to first coil,then according to Faraday’s law an alternating flux surrounding that coil.If suppose any coil present in the range of alternating flux,then this alternating flux cuts the coil.Hence emf induce in the second coil.This is the fundamental working of any transformer.The flux linkage between two coils is always constant.So transformer is also called as constant flux device. #### Based on number of turns in the coil emf will induce in the second coil.The transformer which is discussed above will not work practically.Because in practical applications we have to consider efficiency of transformer,losses,economical aspects.In the above figure you can find that so much flux wasted and not linked with the second coil.This is called leakage flux in the transformer.So to reduce leakage flux we use a magnetic core which gives low reluctance path for flux.We can find reduced leakage flux after placing a magnetic core. ### Mathematics of Transformer #### We heard, transformer can increase or decrease the voltage but up to what level it can increase or decrease ?.This depends on turns ratio (or) transformation ratio(denoted with n or k) of transformer.This can be defined as the ratio of number turns of primary winding to number of secondary winding (or) ratio of primary voltage to secondary voltage. ### Transformer EMF Equation 