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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2

Copper wires of the same length and thickness are connected to points A and B in all the three circuits. In circuit (a) copper wire is not coiled. In circuits (b) and (c), the copper wire is coiled. Observe the circuits and answer the following questions.



(a) When circuit (a) is switched on, what do you observe?


(b) When circuit (b) is switched on, what change do you observe in the intensity of light? Justify your answer.


(c) When circuit (c) is switched on, what change do you observe in the intensity of light? Justify your answer.

 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?

 3

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.