Resistivity of two elements A and B are 1.62x10-8 Ωm and 520x10-8 Ωm respectively. Out of these name the element that can be used to make: i) Filament of electric bulb. ii) Wires for electrical transmission line. Justify?
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Element B can be used to make filament of an electric bulb and element A can be used to make wires of electrical transmission line as the element having less resistivity will give less resistance than the element having more resistivity.
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'B' can be used as a filament of bulb and 'A' can be used in wires.
- Element 'B' has a higher resistivity (1.62 × 10-⁸) than element 'A' (520 × 10-⁸). This means that the resistance per unit length and area of 'B' is more than that of 'A'.
- Materials like 'B' with higher resistivity obstruct current and can be used in heating devices and as filaments of electrical bulbs.
- 'A' having lower resistivity offers less resistance to the flow of current and hence can be used as wires for electrical transmission lines.
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