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The resistance offered by a wire of unit length and unit cross-sectional area is called resistivity. For a material irrespective of length and area, the resistivity is a constant. It is also called specific resistance of the material. Metals and alloys have low resistivity while insulators have high resistivity. Resistivity of two elements A and B are 1.62 x 10-8 Om and 520 x 10-8 Ωm respectively. Out of these two, name the element that can be used to make : (i) filament of electric bulb. (ii) wires for electrical transmission lines. |
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Answer» (i) Element B It has more resistivity (520 x 10-8 Ωm) (ii) Element A It has less resistivity and hence less heating effect. Dissipation of energy during transmission of Power. |
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