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Why are copper and aluminium wires usual...

Why are copper and aluminium wires usually used for electricity transmission?

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Explore conceptually related problems

Explain the following : (a) Why is tungsten used almost axclusively for filament of incandescent lamp ? (b) Why are the conductors of electric heating devices, such as toaster and electric irons, made of an alloy rather than a pure metal ? ( c) Why is the series arrangement not used for domestic circuits ? (d) How does the resistance of a wire vary with its cross-sectional area ? (e ) Why are copper and aluminimum wires usually employed for electricity transmission.

Give reason for the following: (i) Electric bulbs are usually filled with chemically inactive gases like nitrogen and argon. (ii) Copper and aluminium wires are usually employed for electricity transmission. (iii) Fuse wire is placed in series with the device.

Give reasons: Aluminium wire is used to make transmission cables.

LAKHMIR SINGH & MANJIT KAUR-ELECTRICITY -Exercise
  1. Name the material which is the best conductor of electricity.

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  2. Which among iron and mercury is a better conductor of electricity?

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  3. Why are copper and aluminium wires usually used for electricity transm...

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  4. Name the material which is used for making the heating element of an e...

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  5. What is nichrome? State its one use.

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  6. Why is nichrome used as a heating element ?

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  7. Why are coils of electric toasters and electric irons made of an alloy...

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  8. Which has more resistance: (a) a long piece of nichrome wire or shor...

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  9. (a) How does the resistance of a pure metal change if its temperature ...

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  10. Fill in the following blanks with suitable words: Resistance is meas...

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  11. (a) What do you understand by the ''resistivity'' of a substance? (b...

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  12. (a) Write down an expression for the resistance of a metallic wire in ...

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  13. (a) Give two examples of substances which are good conductors of elect...

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  14. Will current flow more easily through a thick wire or a thin wire of t...

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  15. How does the resistance of a conductor depend on: (a) length of the ...

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  16. (a) Give one example to show how the resistance depends on the nature ...

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  17. What would be the effect on the resistance of a metal wire of: (a) i...

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  18. How does the resistance of a wire vary with its: (a) area of cross-s...

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  19. How does the resistance of a wire change when: (i) its length is tri...

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  20. Calculate the area of cross-section of a wire if its length is 1.0 m, ...

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