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A transformer is an extended version of an inductor. The flux that is created inside the inductor is used here to induce voltages at other coil, which is termed as secondary coil. If

the rate of change of flux can induce voltage across the primary coil, from which it iscreated, then it is also possible to induce voltage across secondary coil, provided that we can pull the flux to flow through the other coil. The rate of change of flux will induce

voltage as many turn we use. If the turn is double the turn in primary then the voltage will

also be double. If we increase the number of secondary coils, then voltage will be induced

in all the secondary coils according to the number of turns present in each secondary coil.

We can increase or decrease the secondary voltage level according to our requirement. If

the secondary voltage is increased then it is called step up transformer and for the

decreasing case it is called step down transformer. Each secondary voltage will act as a

separate voltage source. Here the other advantage we get from a transformer is that each

secondary voltage source is an isolated voltage source. There is no electrical connection

between the primary and the secondary.