Many domestic hair-dryers have no earth wire. Why?

The fan prevents the heating coil from becoming too hot.

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The current is small.

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The casing of the hair-dryer is made of plastic material.

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The plug is installed with a fuse.

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Solution

The correct option is D The casing of the hair-dryer is made of plastic material.
The electrical appliances are earthed so as to avoid an electric shock. But we know that plastic is very good insulator. So the casting of hair-dryer is made up of plastic material and thus we do not need to earth the hair-dryers.

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In normal use, a current of 3.5 A flows through a hair dryer. Choose a suitable fuse from the following :

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While drying hair using a hair dryer, the following method is applied:

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