Q6 of 19 Page 12

Why are copper and aluminium wires usually used for electricity transmission? (CBSE 2008, 2006)

Copper and aluminium wires usually used for electricity transmission because copper and aluminium are very good conductors of electricity having very low electric resistivity (or resistance).

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What is meant by saying that the electric potential at a point is 1 volt? ( CBSE 2006)

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State the factors on which the strength of electric current flowing in a given conductor depends. ( CBSE 2008)

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How is an ammeter and a voltmeter connected in a circuit and why? ( CBSE 2010)

 8

a. Table gives the resistivity of three materials in (in Ω m) A, B, C.


Which one of them is the best conductor? And which is an insulator and why?


b. A wire of resistivity P is stretched to twice its length. What will be its new resistivity?

( CBSE 2012, 2011)