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प्रश्न
Name the material of wire used for making standard resistances. Give a reason.
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उत्तर
Constantan is used for making standard resistances. The reason is that its resistance remains almost unaffected with change in temperature.
संबंधित प्रश्न
The V-I graph for a series combination and for a parallel combination of two resistors is shown in the figure below. Which of the two A or B. represents the parallel combination? Give reasons for your answer.
How does the presence of impurities in a metal affect its resistance?
Give one example to show how the resistance depends on the nature of material of the conductor.
Calculate the resistance of an aluminium cable of length 10 km and diameter 2.0 mm if the resistivity of aluminium is 27 × 10−8 Ωm.
How does the resistance of a wire change when:
its length is tripled?
Define the term resistivity and state its S.I. unit. Which will have higher resistivity a conductor or an insulator.
State expression for Cells connected in parallel.
If the current I through a resistor is increased by 100% (assume that temperature remains unchanged), the increase in power dissipated will be:
