The electrical resistivity of few materials is give below in ohm .which of these materials can be used for making element of a heating device? a. 6.84 * 10^-8 b. 1.60 * 10^-8 c. 1.00 * 10^-4 d. 2.50 * 10^2 e. 4.40 * 10^-5 f. 2.30 * 10^17 ( ^ denotes raised to the power) c.
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The metal and alloys have very low resistivity in the range of 10^-8 ohm to 10^-6 ohm.So they are good conductor of electricity.While insulators have resistivity of the order of 10^12 to10^17 ohm.Alloys have generally higher resistivity than its constituents metal and consider good for the heating elements.So option C and E are considered best for making heating elements.While option D and F are considered as insulator and option A and B are good conductor of electricity.
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Explanation:The metal and alloys have very low resistivity in the range of 10^-8 ohm to 10^-6 ohm.So they are good conductor of electricity.While insulators have resistivity of the order of 10^12 to10^17 ohm.Alloys have generally higher resistivity than its constituents metal and consider good for the heating elements.So option C and E are considered best for making heating elements.While option D and F are considered as insulator and option A and B are good conductor of electricity
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