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4. Work and Energy
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Q13 of 146 Page 162

Name the device which converts electrical energy into mechanical energy.

Electric Motor

An electric motor is an electrical machine that converts electrical energy into mechanical energy.


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11

What is the common name of ‘1 kWh of electrical energy’?

12

A cell converts one form of energy into another form. Name the two forms.

14

Name the devices or machines which convert:

(a) Mechanical energy into electrical energy.


(b) Chemical energy into electrical energy.


(c) Electrical energy into heat energy.


(d) Electrical energy into light energy.

15

Name the devices or machines which convert:

(i) Electrical energy into sound energy.


(ii) Hear energy into kinetic energy (or mechanical energy).


(iii) Chemical energy into kinetic energy (or mechanical energy).


(iv) Chemical energy into heat energy.


(v) Light energy into heat energy.

Questions · 146
4. Work and Energy
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