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

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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

वीडियो ट्यूटोरियलVIEW ALL [1]

संबंधित प्रश्न

What is (a) the highest, (b) the lowest total resistance that can be secured by combinations of four coils of resistance 4 Ω, 8 Ω, 12 Ω, 24 Ω?


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Copper is a good .......... Plastic is an ..........


What is meant by conductors and insulators? Give two examples of conductors and two of insulators.


Which of the following are conductors and which are insulators?

Sulphur, Silver, Copper, Cotton, Aluminium, Air, Nichrome, Graphite, Paper, porcelain, Mercury, Mica, Bakelite, Polythene, Manganin.


Which has less electrical resistance : a thin wire or a thick wire (of the same length and same material)?


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


Name the electrical property of a material whose symbol is "omega".


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


Which among iron and mercury is a better conductor of electricity?


 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?

 


Calculate the resistance of a copper wire 1.0 km long and 0.50 mm diameter if the resistivity of copper is 1.7 × 10−8 Ω m.


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

increasing its length?


Calculate the area of cross-section of a wire if its length is 1.0 m, its resistance is 23 Ω and the resistivity of the material of the wire is 1.84 × 10−6 Ω m.


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. 


Resistance of a metal wire of length 5 m is 100 Ω . If the area of cross - section of the wire is `3 × 10^-7  "m"^2` , Calculate the resistivity of the metal . 


Assertion: Conductors allow the current to flow through themselves.

Reason: They have free charge carriers.


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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