Q6 of 19 Page 60

How does the short circuit form? What is its effect?

When live wire comes in contact with neutral wire a large amount of current flows through it leading to short-circuiting. The resistance of circuit becomes very small thus a large number of current flows leading to the production of a large amount of heat thus may cause electric fires. This may damage our electrical appliances. We can also get electric shocks thus short-circuiting is dangerous.


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4

Explain the difference:

AC generator and DC generator.

 5

Which device is used to produce electricity? Describe with a neat diagram.

a. Electric motor


b. Galvanometer


c. Electric Generator (DC)


d. Voltmeter

 7

Give Scientific reasons.

Tungsten metal is used to make a solenoid type coil in an electric bulb.

 7

Give Scientific reasons.

In the electric equipment producing heat e.g. iron, electric heater, boiler, toaster etc, an alloy such as Nichrome is used, not pure metals.