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According to Faraday's law of electromagnetic induction, there will be an EMF induced in the second coil.The coil which gives the desired output voltage due to mutual induction is commonly known as the 'secondary coil'.The purpose of the transformer iron core is to provide a low reluctance path, through which the maximum amount of flux produced by the primary coil is passed through and linked with the secondary coil.Conversely, a transformer that decreases volt age between the primary to secondary coils is defined as a step-down transformer.A transformer that increases voltage between the primary to secondary coils 'is defined as a step-up transformer.a primary coil.??

According to Faraday’s law of electromagnetic induction, there will be an EMF
induced in the second coil. If the circuit of this secondary coil is closed, then a current
will flow through it. This is the basic working principle of a transformer.
There are three basic parts of a transformer:
 an iron core that serves as a magnetic conductor.
 a primary coil.
 a secondary coil.
The purpose of the transformer iron core is to provide a low reluctance path,
through which the maximum amount of flux produced by the primary coil is passed
through and linked with the secondary coil. The coil which receives electrical power
from the source is known as the ‘primary coil’. The coil which gives the desired
output voltage due to mutual induction is commonly known as the ‘secondary coil’.
This is the ‘Second Coil’.
How transformers work?
A transformer that increases voltage between the primary to secondary coils ‘is
defined as a step-up transformer. Conversely, a transformer that decreases volt age
between the primary to secondary coils is defined as a step-down transformer.
Whether the transformer increases or decreases the voltage level depends on the
relative number of turns between the primary and secondary side of the transformer.
If there are more turns on the primary coil than the secondary coil than the voltage
will decrease (step down).