Q1 of 14 Page 56


(a) Write down the name of parts numbered in the diagram.


(b) State the working principle of this device.

(a) 1) Magnetic north pole of field magnet.

2)Armature


3)Slip Rings


(b) It converts mechanical energy to electrical energy, and operates on the principle of electromagnetic induction, i.e. changing magnetic field induces an electric field.


More from this chapter

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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.

 6

Thick insulated copper wires are used in the primary coil of a step up transformer and in the secondary of a step-down transformer. What is the necessity of doing this? Why is it so?

 1

Make coils of a different number of turns using insulated copper wire. Use magnets of different strengths to produce induced emf. Present this activity in the science club.

 2

Michael Faraday, the father of electricity, did not even get elementary education. Are you not inspired by the achievements of Faraday in the field of science?

Conduct a seminar on “Contributions of Faraday and the hard work behind it.”