Q3 of 14 Page 56

The current in the secondary coil of a transformer is 1A and that in the primary is 0.5 A.

Explain the working principle of a transformer.

The diagram is shown below:


i. In a transformer, the AC voltage applied to the primary coil produces a varying magnetic field.


ii. By electromagnetic induction, an emf is induced in the primary. The change of flux in the primary coil is linked with the secondary.


iii. Hence an emf is induced in the secondary coil as well.


iv. Thus the emf induced in each turn of the primary coil and secondary coil will be same.


v. In this way, the voltage across the primary coil is stepped up or stepped down depending on the turns ratio of the primary and secondary coils.


More from this chapter

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3

The current in the secondary coil of a transformer is 1A and that in the primary is 0.5 A.

What type of a transformer is this?

 3

The current in the secondary coil of a transformer is 1A and that in the primary is 0.5 A.

If 200 V is available in the secondary coil of this transformer, what is the voltage in the primary?

 4

In connection with the working of a microphone, a few statements are given in boxes.

Arrange them in the proper order.


 5

Given below is a graph of the output from the secondary coil of a transformer. Observe the graph and answer the following questions.


(a) The electricity produced from which type of generator does the given graph represent?


(b) The maximum and minimum voltages in A, B, C are the same Give the reason.