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How Does the Resistance of a Conductor Depend On: Temperature of the Conductor?

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प्रश्न

How does the resistance of a conductor depend on: 

 temperature of the conductor?

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उत्तर

The resistance also depends on the temperature of the conductor. It increases on raising the temperature and decreases on lowering the temperature.

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अध्याय 1: Electricity - Exercise 4

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लखमीर सिंग Physics (Science) [English] Class 10
अध्याय 1 Electricity
Exercise 4 | Q 18.3

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संबंधित प्रश्न

Why are copper and aluminium wires usually employed for electricity transmission?


What is the general name of the substances having infinitely high electrical resistance?


Distinguish between good conductors, resistors and insulators. Name two good conductors, two resistance and two insulators.


 What is meant by the "resistance of a conductor" ? Write the relation between resistance, potential difference and current.


What happens to the resistance as the conductor is made thicker?


Which has more resistance:    

 a thick piece of nichrome wire or a thin piece?


What do you understand by the "resistivity" of a substance?


 A wire is 1.0 m long, 0.2 mm in diameter and has a resistance of 10 Ω. Calculate the resistivity of its material?

 


 Give two examples of substances which are good conductors of electricity. Why do you think they are good conductors of electricity?


What would be the effect on the resistance of a metal wire of:

increasing its length?


What would be the effect on the resistance of a metal wire of:  

increasing its temperature?

 


The figure blow shows a variable resistor in a dimmer switch.  

How would you turn the switch to make the lights: (a) brighter, and  (b) dimmer? Explain your answer. 


Materials which allow larger currents to flow through them are called:


The element used almost exclusively for filaments of incandescent lamps:


Assertion: Conductors allow the current to flow through themselves.

Reason: They have free charge carriers.


How will you infer with the help of an experiment that the same current flows through every part of the circuit containing three resistances in series connected to a battery?


The resistance of a wire of 0.01 cm radius is 10 Ω. If the resistivity of the wire is 50 × 10-8 Ω, find the length of this wire.


How will the resistance of a wire be affected if its

  1. length is doubled, and
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Give justification for your answer.


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