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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
Judge the equivalent resistance when the following are connected in parallel − (a) 1 Ω and 106Ω, (b) 1 Ω and 103Ω and 106Ω.
How does the resistance of a wire change when:
its length is tripled?
Draw a V-I graph for a conductor at two different temperatures. What conclusion do you draw from your graph for the variation of resistance of conductor with temperature?
State the order of resistivity of (i) a metal, (ii) a semiconductor and (iii) an insulator.
What potential difference is needed to drive a current o f 1 A through a 5 Ω resistor?
State the effect of rise in temperature on the resistance of semi-conductors.
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.
