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For electric power transmission, copper ...

For electric power transmission, copper or aluminium wire is used.

Text Solution

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(i.) Copper and aluminium contain large number of free electrons.
(ii.) These free electrons can move throughout conductor easily.
(iii.) This results into copper and aluminium having low values of resistivity.
(iv.) Thus, copper and aluminium are good conductors of electricity and offer low resistance to the flow of current.
Hence, aluminium and copper are used for electric power transmission.
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  • Consider the following statements about aluminium: (1) It is the third most abundant element in the earth's crust (2) It is used to make overhead electric transmission lines (3) Aluminium vessels cannot be used for making alkali solutions. Of these statements, the correct ones are

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  • Assertion : Copper and aluminium are used to make electric wires. Reason : Copper and aluminium are good conductors of electricity.

    A
    If both assertion and reason are true and reason is the correct explanation of assertion.
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    If both assertion and reason are true but reason is not the correct explanation of assertion.
    C
    If assertion is true but reason is false
    D
    If both assertion and reason are false.

  • The reason(s) why aluminium is preferred over copper for making overhead transmission cables (i) Aluminium is lighter than copper (ii) aluminium is harder than copper (iii) aluminium is less soluble in water than copper.

    A
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