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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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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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