Q25 of 146 Page 163

Describe the energy changes which take place in a radio.

Radio converts electrical energy into kinetic energy and finally into sound energy.

It can be shown as-


Electrical Energy → Kinetic Energy → Sound Energy


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23

How much electrical energy in joules does a 100 watt lamp consumes:

(a) In 1 second?


(b) In 1 minute?

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Five electric fans of 120 watts each are used for 4 hours. Calculate the electrical energy consumed in kilowatt hours.

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Write the energy transformations which take place in an electric bulb (or electric lamp).

 27

Name five appliances or machines which use an electric motor.