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प्रश्न
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उत्तर
The obstruction offered to the flow of current by the wire is called its electrical resistance. It is a kind of friction between the free electrons and the atoms of the conductor along which they flow.
Its SI unit is 'ohm'.
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संबंधित प्रश्न
Complete the following :-
(a)
Name the material which is used for making the heating element of an electric iron.
How does the resistance of a pure metal change if its temperature decreases?
A graph is plotted taking p.d. along y-axis and electric current along x-axis. Name the physical quantity that represents the slope of this graph (Fig.).
Bends in a rubber pipe reduce the flow of water through it. How would the bands in a wire affect its electric resistance?
What material is used for making wire to prepare heating coils? Give a reason.
Define the term resistivity and state its S.I. unit. Which will have higher resistivity a conductor or an insulator.
Write an expression for calculating electrical power in terms of current and resistance.
In the circuit shown below, calculate the equivalent resistance between the points (i) A and B, (ii) C and D.
