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प्रश्न
Give one example to show how the resistance depends on the nature of material of the conductor.
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उत्तर
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संबंधित प्रश्न
An electrical appliance has a resistance of 25 Ω. When this electrical appliance is connected to a 230 V supply line, the current passing through it will be:
(a) 0.92 A
(b) 2.9 A
(c) 9.2 A
(d) 92 A
Name the material which is used for making the heating element of an electric iron.
Write down an expression for the resistance of a metallic wire in terms of the resistivity.
What is (a) highest, and (b)Ω lowest, resistance which can be obtained by combining four resistors having the following resistances?
4 Ω, 8 Ω, 12 Ω, 24 Ω
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.
State how are the two resistors joined with a battery when equivalent resistance is more than either of the two resistances.
In series combination of resistances ______.
What is the equivalent resistance between A and B in the given circuit (Fig?)
Choose the correct alternative and rewrite the following sentence.
If three resistors 2 ohms, 3 ohms and 4 ohms are connected in series, then the effective resistance in the circuit will be _______ ohms.
Answer the following question.
While studying the dependence of potential difference ( V) across a resistor on the current (I) passing through it, in order to determine the resistance of the resistor, a student took 5 readings for different values of current and plotted a graph between V and t. He got a straight line graph passing through the origin. What does the straight-line signify? Write the method of determining the resistance of the resister using this graph.
A given metallic wire of resistance R is doubled on itself. What will be its new resistance?
How does the resistance of an alloy, vary with temperature?
What material is used for making wire to prepare heating coils? Give a reason.
Three resistors of 6Ω, 3Ω and 2Ω are connected together so that their total resistance is greater than 6Ω but less than 8Ω Draw a diagram to show this arrangement and calculate its total resistance.
Two wires of same material and same lengths have radii in the ratio of 2 : 3, Compare their resistances.
In an electrical circuit, two resistors of 2 Ω and 4 Ω respectively are connected in series to a 6 V battery. The heat dissipated by the 4 Ω resistor in 5 s will be ______.
Consider the following combinations of resistors:
The combinations having equivalent resistance 1 Q is/are ______.
