1.

Answer the following questions. (a) Why is the direction of the current in an electric motor reversed after every half round? (b) How can the strength of an electro-magnet be increased? (c) What is the principle of the electric motor? (d) Why is there a key in an electrical circuit? (e) Is the mechanism of a shirt button like that of the key in an electric circuit?

Answer»

Answer the following questions.



(a) Why is the direction of the current in an electric motor reversed after every half round?



(b) How can the strength of an electro-magnet be increased?



(c) What is the principle of the electric motor?



(d) Why is there a key in an electrical circuit?



(e) Is the mechanism of a shirt button like that of the key in an electric circuit?



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