Chapter 13: Problem 12
Name some devices in which electric motors are used.
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These are the key concepts you need to understand to accurately answer the question.
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Chapter 13: Problem 12
Name some devices in which electric motors are used.
These are the key concepts you need to understand to accurately answer the question.
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What is the function of an earth wire? Why is it necessary to earth metallic appliances?
The phenomenon of electromagnetic induction is (a) the process of charging a body. (b) the process of generating magnetic field due to a current passing through a coil. (c) producing induced current in a coil due to relative motion between a magnet and the coil. (d) the process of rotating a coil of an electric motor.
The device used for producing electric current is called a (a) generator. (b) galvanometer. (c) ammeter. (d) motor.
State whether the following statements are true or false. (a) An electric motor converts mechanical energy into electrical energy. (b) An electric generator works on the principle of electromagnetic induction. (c) The field at the centre of a long circular coil carrying current will be parallel straight lines. (d) A wire with a green insulation is usually the live wire of an electric supply.
At the time of short circuit, the current in the circuit (a) reduces substantially. (b) does not change. (c) increases heavily. (d) vary continuously.
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