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Conductors have many uses. Some of them are:
(i) Electric Heaters apply conductor principle to heat water
(ii) Microwave ovens also work due to conductors
(iii) In a cooling system, conductors are more widely used. 

(i) Insulators are used as woolen clothes in winter
(ii) Insulators are used in electric cables to prevent loss of energy
(iii) Insulators are used in places where heat should not be lost. 
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