Dogcare manager interview questions and answers

36. Comment on the working principle of operation of a 
single-phase transformer.
Working principle of operation of a single-phase transformer can be 
explained as
An AC supply passes through the primary winding, a current will start 
flowing in the primary winding. As a result, the flux is set. This flux is 
linked with primary and secondary windings. Hence, voltage is induced 
in both the windings. 
Now, when the load is connected to the secondary side, the current will 
start flowing in the load in the secondary winding, resulting in the flow 
of additional current in the secondary winding. Hence, according to 
Faraday’s laws of electromagnetic induction, emf will be induced in both 
the windings. 
The voltage induced in the primary winding is due to its self inductance 
and known as self induced emf and according to Lenze’s law it will 
oppose the cause i.e. supply voltage hence called as back emf. The 
voltage induced in secondary coil is known as mutually induced voltage. 
Hence, transformer works on the principle of electromagnetic induction.
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