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Electric Current

Which among t...

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Which among the following elements cannot be used for making electrical wires?

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Q. Explain the following:
(a) Why is tungsten used almost exclusively for filament of electric lamps?
(b) Why are copper and aluminium wires usually used for electricity transmission?
(c)Why is nichrome alloy used for making elements of electric irons?

List any two properties for each of the following case of metals which makes them available to be used as

(i) wires for electrical connections

Q. The electrical resistivities of five substances A, B, C, D and E are given below:

A		5.20 × 10⁻⁸ Ω m
B		110 × 10⁻⁸ Ωm
C		2.60 × 10⁻⁸ Ωm
D		10.0 × 10⁻⁸ Ωm
E		1.70 × 10⁻⁸ Ωm

(a) Which substance is the best conductor of electricity? Why?
(b) Which one is a better conductor : A or C? Why?
(c) Which substance would you advice to be used for making heating elements of electric iron? Why?
(d) Which two substances should be used for making electric wires? Why?

Q. why is graphite not used for making electrical wires??

Q. Which of the following property is not responsible for copper to be used as electrical conduction wires?

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